static void RecursionFactorialExample01()
        {
            const int num = 5;

            Console.WriteLine($"num = {num}");
            Console.WriteLine($"Factorial(num) = {RecursionFactorial.Factorial(num)}");
        }
 public void RecursionFactorialTest()
 {
     for (int i = 0; i < FactorialTable.Length / 2; i++)
     {
         Assert.AreEqual(FactorialTable[i, 1], RecursionFactorial.Factorial(FactorialTable[i, 0]));
     }
 }