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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 112 |
| 5 | 4912 |
| 6 | 265440 |
| 7 | 31924032 |
| 8 | 3170361984 |
| 9 | 597787563264 |
| 10 | 97379218955520 |
| 11 | 26489701471180800 |
| 12 | 6432079809975552000 |
[0,0,0,112,4912,265440,31924032,3170361984, 597787563264,97379218955520,26489701471180800, 6432079809975552000] |