n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 2 |
4 | 8 |
5 | 24 |
6 | 136 |
7 | 960 |
8 | 5312 |
9 | 40320 |
10 | 491776 |
11 | 4112640 |
12 | 40270592 |
13 | 638668800 |
14 | 6249389056 |
15 | 91883151360 |
16 | 1919826163712 |
17 | 20922789888000 |
18 | 355897293438976 |
19 | 8676514912665600 |
20 | 121674189293944832 |
21 | 2757288942600192000 |
[0,1,2,8,24,136,960,5312,40320,491776,4112640, 40270592,638668800,6249389056,91883151360, 1919826163712,20922789888000,355897293438976, 8676514912665600,121674189293944832, 2757288942600192000] |