n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 2 |
4 | 24 |
5 | 24 |
6 | 720 |
7 | 720 |
8 | 4480 |
9 | 40320 |
10 | 3628800 |
11 | 3628800 |
12 | 479001600 |
13 | 95800320 |
14 | 2641766400 |
15 | 87178291200 |
16 | 1902071808000 |
17 | 20922789888000 |
18 | 6402373705728000 |
19 | 6402373705728000 |
20 | 810967336058880000 |
21 | 143111882833920000 |
22 | 66117689869271040000 |
23 | 13223537973854208000 |
[1,1,2,2,24,24,720,720,4480,40320,3628800,3628800, 479001600,95800320,2641766400,87178291200, 1902071808000,20922789888000,6402373705728000, 6402373705728000,810967336058880000, 143111882833920000,66117689869271040000, 13223537973854208000] |