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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3628800 |
| 2 | 6290830003852800 |
| 3 | 30306073546461323055916800 |
| 4 | 231242270452155338291905203314956800 |
| 5 | 2293197130058463838438742129627609575368940800 |
| 6 | 26941822036577030394903099245279465611395585827577676800 |
[1,3628800,6290830003852800, 30306073546461323055916800, 231242270452155338291905203314956800, 2293197130058463838438742129627609575368940800, 26941822036577030394903099245279465611395585827577\ 676800] |