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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 8 |
| 4 | 104 |
| 5 | 6440 |
| 6 | 312960 |
| 7 | 36965712 |
| 8 | 3615441408 |
| 9 | 668391093888 |
| 10 | 108118788084480 |
| 11 | 29018593889026560 |
| 12 | 7014015968947706880 |
[1,0,8,104,6440,312960,36965712,3615441408, 668391093888,108118788084480,29018593889026560, 7014015968947706880] |