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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | -15 |
| 3 | -1029 |
| 4 | -46239 |
| 5 | -2582701 |
| 6 | -223494895 |
| 7 | -31551766453 |
| 8 | -6578644464703 |
| 9 | -1828823841664733 |
| 10 | -641975997431127503 |
| 11 | -276576165893943654373 |
| 12 | -143429494944516129401055 |
| 13 | -88139150252441009278574733 |
| 14 | -63329932634044318341466520239 |
[1,3,-15,-1029,-46239,-2582701,-223494895, -31551766453,-6578644464703,-1828823841664733, -641975997431127503,-276576165893943654373, -143429494944516129401055, -88139150252441009278574733, -63329932634044318341466520239] |