1
1
2
2
2x1
3
6
3x2x1
4
24
4x3x2x1
5
120
5x4x3x2x1
6
720
6x5x4x3x2x1
7
5040
7x6x5x4x3x2x1
8
40320
8x7x6x5x4x3x2x1
9
362880
9x8x7x6x5x4x3x2x1
10
3628800
10x9x8x7x6x5x4x3x2x1