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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 24 |
| 4 | 12 |
| 5 | 2640 |
| 6 | 7536 |
| 7 | 9408 |
| 8 | 2688 |
| 9 | 208445760 |
| 10 | 1082368560 |
| 11 | 4312566720 |
| 12 | 12473296800 |
| 13 | 24050669760 |
| 14 | 27034640640 |
| 15 | 13900259520 |
| 16 | 1813091520 |
[1,2,24,12,2640,7536,9408,2688,208445760, 1082368560,4312566720,12473296800,24050669760, 27034640640,13900259520,1813091520] |