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| n | a(n) |
|---|---|
| 1 | 1680 |
| 2 | 90291600 |
| 3 | 12025780892160 |
| 4 | 2407147216735338000 |
| 5 | 607807501825156719166080 |
| 6 | 178355054529362612768336870400 |
| 7 | 58142871081888953760431694254592000 |
[1680,90291600,12025780892160,2407147216735338000, 607807501825156719166080, 178355054529362612768336870400, 58142871081888953760431694254592000] |