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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -4 |
| 2 | 104 |
| 3 | -37632 |
| 4 | 166534720 |
| 5 | -9109541173248 |
| 6 | 6487005386806124544 |
| 7 | -62637995710787181892993024 |
| 8 | 8428730138560436521519921925857280 |
| 9 | -16103390694987849639716307556519680725483520 |
[1,-4,104,-37632,166534720,-9109541173248, 6487005386806124544,-62637995710787181892993024, 8428730138560436521519921925857280, -16103390694987849639716307556519680725483520] |