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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | -1 |
| 3 | -17280 |
| 4 | 1168415539200 |
| 5 | 980041972344422400000000 |
| 6 | -24517645963803990318633839493120000000000 |
| 7 | -37442952699741306217982755284947059704721771069440000000000000 |
[0,-1,-17280,1168415539200, 980041972344422400000000, -24517645963803990318633839493120000000000, -3744295269974130621798275528494705970472177106944\ 0000000000000] |