B_141121_factorial01

 gcc 

  0 -->                    1
  1 -->                    1
  2 -->                    2
  3 -->                    6
  4 -->                   24
  5 -->                  120
  6 -->                  720
  7 -->                 5040
  8 -->                40320
  9 -->               362880
 10 -->              3628800
 11 -->             39916800
 12 -->            479001600
 13 -->           6227020800
 14 -->          87178291200
 15 -->        1307674368000
 16 -->       20922789888000
 17 -->      355687428096000
 18 -->     6402373705728000
 19 -->   121645100408832000