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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 96 |
| 5 | 480 |
| 6 | 103680 |
| 7 | 725760 |
| 8 | 743178240 |
| 9 | 60197437440 |
| 10 | 60197437440000 |
| 11 | 662171811840000 |
| 12 | 1977234435405250560000 |
| 13 | 25704047660268257280000 |
| 14 | 70531906779776097976320000 |
| 15 | 238045185381744330670080000000 |
| 16 | 249608468306847943276709806080000000 |
[1,2,6,96,480,103680,725760,743178240,60197437440, 60197437440000,662171811840000, 1977234435405250560000,25704047660268257280000, 70531906779776097976320000, 238045185381744330670080000000, 249608468306847943276709806080000000] |