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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 6 |
| 5 | 210 |
| 6 | 47250 |
| 7 | 76734000 |
| 8 | 1007670888000 |
| 9 | 119030115974112000 |
| 10 | 139586617002841142400000 |
| 11 | 1780228528528626725525222400000 |
| 12 | 268668486342998603475774101557862400000 |
| 13 | 518949181117200500866291866458307199421644800000 |
| 14 | 13802344536617079696362247660105733403745253587733708800000 |
[1,6,210,47250,76734000,1007670888000, 119030115974112000,139586617002841142400000, 1780228528528626725525222400000, 268668486342998603475774101557862400000, 518949181117200500866291866458307199421644800000, 13802344536617079696362247660105733403745253587733\ 708800000] |