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| n | a(n) |
|---|---|
| 3 | 1200 |
| 4 | 5400 |
| 5 | 29520 |
| 6 | 187200 |
| 7 | 1310400 |
| 8 | 9813600 |
| 9 | 77193600 |
| 10 | 630538632 |
| 11 | 5307656400 |
[1200,5400,29520,187200,1310400,9813600,77193600, 630538632,5307656400] |