| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 12 |
| 4 | 864 |
| 5 | 41328 |
| 6 | 2009952 |
| 7 | 116220672 |
| 8 | 8608449792 |
| 9 | 850781715456 |
| 10 | 114969127987200 |
| 11 | 21579927922212864 |
| 12 | 5686939126548676608 |
| 13 | 2120212910213354962944 |
[0,0,12,864,41328,2009952,116220672,8608449792, 850781715456,114969127987200,21579927922212864, 5686939126548676608,2120212910213354962944] |