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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 12 |
| 4 | 1680 |
| 5 | 11880 |
| 6 | 13366080 |
| 7 | 96909120 |
| 8 | 424097856000 |
| 9 | 3100796899200 |
| 10 | 37276043023296000 |
| 11 | 273589847231500800 |
| 12 | 7359037761652306329600 |
| 13 | 54123776422857453312000 |
| 14 | 2844359511118991175518208000 |
[1,2,12,1680,11880,13366080,96909120,424097856000, 3100796899200,37276043023296000, 273589847231500800,7359037761652306329600, 54123776422857453312000, 2844359511118991175518208000] |