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| n | a(n) |
|---|---|
| 1 | 720 |
| 2 | 190800 |
| 3 | 15321600 |
| 4 | 283046400 |
| 5 | 812851200 |
| 6 | 812851200 |
| 7 | 61479419904000 |
[720,190800,15321600,283046400,812851200, 812851200,61479419904000] |