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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | -12 |
| 3 | -120 |
| 4 | 1680 |
| 5 | 574560 |
| 6 | 100457280 |
| 7 | 18871332480 |
| 8 | 4068839174400 |
| 9 | 997177467686400 |
| 10 | 265676948766028800 |
| 11 | 68775633656816486400 |
| 12 | 9975596960728285286400 |
| 13 | -9408345873371957191680000 |
| 14 | -16902988368910895971399680000 |
[1,-2,-12,-120,1680,574560,100457280,18871332480, 4068839174400,997177467686400,265676948766028800, 68775633656816486400,9975596960728285286400, -9408345873371957191680000, -16902988368910895971399680000] |