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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 72 |
| 4 | 24 |
| 5 | 2160 |
| 6 | 360 |
| 7 | 205320 |
| 8 | 208680 |
| 9 | 94800 |
| 10 | 34200 |
| 11 | 7920 |
| 12 | 1560 |
| 13 | 120 |
[1,8,72,24,2160,360,205320,208680,94800,34200, 7920,1560,120] |