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| n | a(n) |
|---|---|
| 2 | 6 |
| 3 | 30240 |
| 4 | 435891456000 |
| 5 | 64630041847212441600000 |
| 6 | 258328699159653623241666283438080000000 |
[6,30240,435891456000,64630041847212441600000, 258328699159653623241666283438080000000] |