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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 12 |
| 3 | 120 |
| 4 | 12432 |
| 5 | 680640 |
| 6 | 102772032 |
| 7 | 14295765120 |
| 8 | 3342487648512 |
| 9 | 854980598876160 |
| 10 | 298224965387983872 |
| 11 | 119257847834622351360 |
| 12 | 59074248780911484506112 |
| 13 | 33687669462151354934968320 |
[1,0,12,120,12432,680640,102772032,14295765120, 3342487648512,854980598876160,298224965387983872, 119257847834622351360,59074248780911484506112, 33687669462151354934968320] |