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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 429 |
| 3 | 49884120 |
| 4 | 22745605840236 |
| 5 | 165850226337286576800 |
| 6 | 2500267880518574604245088816 |
| 7 | 233099041543988273824859604028713600 |
[1,429,49884120,22745605840236, 165850226337286576800, 2500267880518574604245088816, 233099041543988273824859604028713600] |