inline _factorialCache to a static readonly field

Assembly size should not be an issue in this code.
Should be a bit faster, since _factorialCache should now stay in the data segment (cached) instead of global memory
values are store as hexadecimal constants, to save all bits, so new version returns the exact same values as before

src/Numerics/SpecialFunctions/Factorial.cs

@@ -38,25 +38,10 @@ namespace MathNet.Numerics
     public partial class SpecialFunctions
     {
         const int FactorialMaxArgument = 170;
-        static double[] _factorialCache;
-
-        /// <summary>
-        /// Initializes static members of the SpecialFunctions class.
-        /// </summary>
-        static SpecialFunctions()
+        static readonly double[] _factorialCache =
         {
-            InitializeFactorial();
-        }
-
-        static void InitializeFactorial()
-        {
-            _factorialCache = new double[FactorialMaxArgument + 1];
-            _factorialCache[0] = 1.0;
-            for (int i = 1; i < _factorialCache.Length; i++)
-            {
-                _factorialCache[i] = _factorialCache[i - 1]*i;
-            }
-        }
+            0x3FF0000000000000, 0x3FF0000000000000, 0x4000000000000000, 0x4018000000000000, 0x4038000000000000, 0x405E000000000000, 0x4086800000000000, 0x40B3B00000000000, 0x40E3B00000000000, 0x4116260000000000, 0x414BAF8000000000, 0x418308A800000000, 0x41BC8CFC00000000, 0x41F7328CC0000000, 0x42344C3B28000000, 0x4273077775800000, 0x42B3077775800000, 0x42F437EEECD80000, 0x4336BEECCA730000, 0x437B02B930689000, 0x43C0E1B3BE415A00, 0x4406283BE9B5C620, 0x444E77526159F06C, 0x4495E5C335F8A4CE, 0x44E06C52687A7B9A, 0x4529A940C33F6121, 0x4574D9849EA37EEB, 0x45C19787E5D9F316, 0x460EC92DD23D6966, 0x465BE6518687A784, 0x46AA27EC6E1F2D0C, 0x46F956AD0AAE33A4, 0x474956AD0AAE33A4, 0x479A21627303A541, 0x47EBC3789A33DF95, 0x483E5DCBE8A8BC8B, 0x489114C2B2DEEA0E, 0x48E3C0011ED1BEA0, 0x493774015499125E, 0x498C95619F1A8E63, 0x49E1DD5D037098FE, 0x4A36E39F2C684405, 0x4A8E0AC0EA48D947, 0x4AE42F399D68F1FC, 0x4B3BC0EF38704CBA, 0x4B9383A833AEF5F3, 0x4BEC0D41CA4B818D, 0x4C4499BC508F7324, 0x4C9EE69A78D72CB6, 0x4CF7A88E4484BE3B, 0x4D527BAF2587B49E, 0x4DAD751F23D047DC, 0x4E07EF294D193A63, 0x4E63D20E33D8E45A, 0x4EC0B93BFBBF00AC, 0x4F1CBE5F18B04928, 0x4F792693359A4003, 0x4FD6665B1BBD6103, 0x50344CC291239FEB, 0x5092B6C35DCCD76D, 0x50F18B5727F009F6, 0x5150B8CF1210C97E, 0x51B0330899804332, 0x520FE478EE34844A, 0x526FE478EE34844A, 0x52D0320568F6AB2E, 0x5330B395943E6087, 0x53917C0097314D0D, 0x53F293C0A0A461DE, 0x5454074BAD313983, 0x54B5E7FAC56DD6E7, 0x55184D5A3305DA68, 0x557B5705796695B5, 0x55DF2F423E7902C2, 0x564207524C1DF598, 0x56A5209471331BCE, 0x570916B0466CB105, 0x576E2F4C14BAC4FA, 0x57D264D25CA1D008, 0x5836B473AA57BCCA, 0x589C619094EDABFC, 0x5901F5BD7E3E66D5, 0x596702DAC9BFF3C1, 0x59CDD7B3BDA4F01E, 0x5A33958DF4743D94, 0x5A9A02A088AA61C9, 0x5B0179C3DBD279B3, 0x5B67C1863ED21D6F, 0x5BD0550C4B30743C, 0x5C36B645188F61A3, 0x5C9FF0512A89A14D, 0x5D06B4D9B43DD8AD, 0x5D7051FC798C73BC, 0x5DD7B722E0A0182D, 0x5E416A7D9CF591C1, 0x5EA9DA1274FC845A, 0x5F13638DD7BD6344, 0x5F7D62E2FAFB0A73, 0x5FE67FB5C8283400, 0x605166C698CF1838, 0x60BB30964EC395D8, 0x612574569A26543C, 0x619118B502D68B20, 0x61FB83C3509147E8, 0x62665B0EB1760A6C, 0x62D256B20D92D48D, 0x633E5F96E67B300A, 0x63A963E824AAFA28, 0x64156C4BDEF04312, 0x64823E389BD8991D, 0x64EF5AF14BDC472A, 0x655B30DD3FC905B6, 0x65C7CAC197CFE4FF, 0x663500FEE8058829, 0x66A2B4E306A4ED45, 0x6710CE83F7F82D2C, 0x677E764F3171D1E0, 0x67EBD824633209D7, 0x6859AB418B722112, 0x68C7DD36EFA41ABF, 0x69365F6380A9D913, 0x69A5262C0FA08F34, 0x6A142861FEE5087E, 0x6A835ECE2AF01629, 0x6AF2C3D7B9989578, 0x6B625340AB3F01F7, 0x6BD209F3A89205EF, 0x6C41E5DFC140E1E3, 0x6CB1E5DFC140E1E3, 0x6D2209AB80C363A7, 0x6D9251D22EC67136, 0x6E02BFBD1BDF17DD, 0x6E7355BB04BE109C, 0x6EE4171452ED7D42, 0x6F55082946D09F21, 0x6FC62E9B88B007D5, 0x70379185413B0852, 0x70A939C09FD12EE8, 0x711B3243AC4D8692, 0x718D88957D1C3023, 0x720026B1C06B6A53, 0x7271CA9FCDF6531F, 0x72E3BCC9487D4436, 0x73560CE8DEFBF234, 0x73C8CE85FADB707A, 0x743C19F3C62C956A, 0x74B006CD07056D36, 0x752267CF76103B6C, 0x75954807E082C4B5, 0x7608C5D92B5838FB, 0x767D07DA7ECB62C6, 0x76F11FA1E0C9F743, 0x776455903AEFD5A0, 0x77D84E466672AD59, 0x784D3E2CB341F88F, 0x78C1B4A51088F17F, 0x793594292C26E653, 0x79AA77BA8027B682, 0x7A2055E51B1882A4, 0x7A944AB297A87248, 0x7B095D5F3D928EDA, 0x7B7FE771CB7257AE, 0x7BF4307602BE5B7C, 0x7C69B5B6477E6880, 0x7CE07868C5CCFAF2, 0x7D553B370EFA3B7C, 0x7DCB88CB676C8525, 0x7E41F63CB077CADB, 0x7EB7932FA79D3A3F, 0x7F2F2054EB4D96E7, 0x7FA4AB7864418635
+        };
 
         /// <summary>
         /// Computes the factorial function x -> x! of an integer number > 0. The function can represent all number up