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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 420 |
| 3 | 360360 |
| 4 | 72201776446800 |
| 5 | 591133442051411133755680800 |
| 6 | 6676878045498705789701874602220118271269436344024536000 |
[1,6,420,360360,72201776446800, 591133442051411133755680800, 66768780454987057897018746022201182712694363440245\ 36000] |