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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 24 |
| 4 | 384 |
| 5 | 10240 |
| 6 | 491520 |
| 7 | 44040192 |
| 8 | 7516192768 |
| 9 | 2473901162496 |
| 10 | 1583296743997440 |
| 11 | 1981583836043018240 |
| 12 | 4869940435459321626624 |
| 13 | 23574053482485268906770432 |
| 14 | 225305087149939210031640608768 |
[0,2,24,384,10240,491520,44040192,7516192768, 2473901162496,1583296743997440, 1981583836043018240,4869940435459321626624, 23574053482485268906770432, 225305087149939210031640608768] |