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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -3 |
| 3 | -20 |
| 4 | 66 |
| 5 | 4439 |
| 6 | 454420 |
| 7 | 4873175 |
| 8 | -3803048954 |
| 9 | -7320203267692 |
| 10 | -1403057989033446 |
| 11 | 6669491545211096686 |
| 12 | 78492109668913945526447 |
| 13 | 69591502229308312804788424 |
| 14 | -6243846072108996200105800383026 |
| 15 | -604234376454072219680822138902122079 |
[1,-1,-3,-20,66,4439,454420,4873175,-3803048954, -7320203267692,-1403057989033446, 6669491545211096686,78492109668913945526447, 69591502229308312804788424, -6243846072108996200105800383026, -604234376454072219680822138902122079] |