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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | -1042 |
| 3 | -12632 |
| 4 | 3256780 |
| 5 | 66485744 |
| 6 | -16962423224 |
| 7 | -489901195808 |
| 8 | 123664101613712 |
| 9 | 4641180127773760 |
| 10 | -1158964855054670624 |
| 11 | -53739545172065063296 |
| 12 | 13273074802437996468928 |
| 13 | 735369564714290029481728 |
| 14 | -179616392573875043315708800 |
| 15 | -11610759562843564089946190336 |
[1,4,-1042,-12632,3256780,66485744,-16962423224, -489901195808,123664101613712,4641180127773760, -1158964855054670624,-53739545172065063296, 13273074802437996468928,735369564714290029481728, -179616392573875043315708800, -11610759562843564089946190336] |