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| n | a(n) |
|---|---|
| 1 | 10 |
| 2 | 80 |
| 3 | 2160 |
| 4 | 82720 |
| 5 | 3737120 |
| 6 | 186303840 |
| 7 | 9945915840 |
| 8 | 558476528000 |
| 9 | 32597366872320 |
[10,80,2160,82720,3737120,186303840,9945915840, 558476528000,32597366872320] |