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| n | a(n) |
|---|---|
| 7 | 0 |
| 8 | 40320 |
| 9 | 362880 |
| 10 | 2721600 |
| 11 | 19958400 |
| 12 | 149688000 |
| 13 | 1167566400 |
| 14 | 9535125600 |
| 15 | 81729648000 |
[0,40320,362880,2721600,19958400,149688000, 1167566400,9535125600,81729648000] |