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| n | a(n) |
|---|---|
| 1 | 1680 |
| 2 | 747558000 |
| 3 | 655551508577280 |
| 4 | 853588467101915622000 |
| 5 | 1392491976667637592480814080 |
| 6 | 2631822682451717147804985743769600 |
| 7 | 5516710929099784554483904755922151424000 |
[1680,747558000,655551508577280, 853588467101915622000, 1392491976667637592480814080, 2631822682451717147804985743769600, 5516710929099784554483904755922151424000] |