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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -12 |
| 2 | -9968 |
| 3 | -77575872 |
| 4 | -2494079278848 |
| 5 | -227607911866125312 |
| 6 | -47454799045677121597440 |
| 7 | -19613396255307422099013550080 |
| 8 | -14538029942147907114791552602275840 |
[1,-12,-9968,-77575872,-2494079278848, -227607911866125312,-47454799045677121597440, -19613396255307422099013550080, -14538029942147907114791552602275840] |