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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -6 |
| 2 | 120 |
| 3 | -7056 |
| 4 | 758400 |
| 5 | -130918656 |
| 6 | 33173038080 |
| 7 | -11587651270656 |
| 8 | 5337660866396160 |
| 9 | -3134856182239789056 |
| 10 | 2286367634020679024640 |
| 11 | -2027369655249396662009856 |
| 12 | 2147914157998443571728875520 |
[1,-6,120,-7056,758400,-130918656,33173038080, -11587651270656,5337660866396160, -3134856182239789056,2286367634020679024640, -2027369655249396662009856, 2147914157998443571728875520] |