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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 352128 |
| 4 | 8365213132981 |
| 5 | 2630024635942177123650 |
| 6 | 7011583640699581889649892843200 |
| 7 | 115401909362364329779895671658357933292000 |
[0,1,352128,8365213132981,2630024635942177123650, 7011583640699581889649892843200, 115401909362364329779895671658357933292000] |