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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | 24 |
| 3 | -496 |
| 4 | 24192 |
| 5 | -1246464 |
| 6 | 150408192 |
| 7 | -12132673536 |
| 8 | 3380973895680 |
| 9 | -253363927449600 |
| 10 | 217523969745223680 |
| 11 | 4682388187242823680 |
| 12 | 35388810383588767825920 |
| 13 | 8821171867345211810119680 |
[1,-2,24,-496,24192,-1246464,150408192, -12132673536,3380973895680,-253363927449600, 217523969745223680,4682388187242823680, 35388810383588767825920,8821171867345211810119680] |