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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5040 |
| 2 | 326918592000 |
| 3 | 1211813284635233280000 |
| 4 | 64240926985765022013480960000000 |
| 5 | 24899758399899222849902687670779904000000000 |
| 6 | 47355329866546908076714664639943599847875543040000000000 |
[1,5040,326918592000,1211813284635233280000, 64240926985765022013480960000000, 24899758399899222849902687670779904000000000, 47355329866546908076714664639943599847875543040000\ 000000] |