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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -12 |
| 2 | -3248 |
| 3 | -25240512 |
| 4 | -722745554688 |
| 5 | -61363036297915392 |
| 6 | -12105663188188359045120 |
| 7 | -4791193110632356981925068800 |
[1,-12,-3248,-25240512,-722745554688, -61363036297915392,-12105663188188359045120, -4791193110632356981925068800] |