n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 6 |
3 | 150 |
4 | 7560 |
5 | 642600 |
6 | 82328400 |
7 | 14799985200 |
8 | 3550699152000 |
9 | 1095489931536000 |
10 | 422416533258720000 |
11 | 199001229578030880000 |
12 | 112442434205652270720000 |
13 | 75042084306026165328000000 |
[0,1,6,150,7560,642600,82328400,14799985200, 3550699152000,1095489931536000,422416533258720000, 199001229578030880000,112442434205652270720000, 75042084306026165328000000] |