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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | -8 |
| 4 | 1296 |
| 5 | 7962624 |
| 6 | -2985984000000 |
| 7 | -100306130042880000000 |
| 8 | 416336312719673760153600000000 |
| 9 | 281633758444745849464726940024832000000000 |
[1,-1,-8,1296,7962624,-2985984000000, -100306130042880000000, 416336312719673760153600000000, 281633758444745849464726940024832000000000] |