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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 210960 |
| 4 | 3763475372581 |
| 5 | 1240457049015641715900 |
| 6 | 4983454435498876364888734279560 |
| 7 | 177385566361246999857025320669145541704035 |
[0,1,210960,3763475372581,1240457049015641715900, 4983454435498876364888734279560, 177385566361246999857025320669145541704035] |