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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 1 |
| 3 | -4 |
| 4 | 4 |
| 5 | -16 |
| 6 | 3056 |
| 7 | -1856 |
| 8 | 181312 |
| 9 | -35853056 |
| 10 | 1670556928 |
| 11 | -39832634368 |
| 12 | 545273832448 |
| 13 | -19385421824 |
| 14 | 53026545299456 |
| 15 | -2753673793480966144 |
| 16 | 68423881271489019904 |
| 17 | -22654998127210332160 |
[1,-1,1,-4,4,-16,3056,-1856,181312,-35853056, 1670556928,-39832634368,545273832448,-19385421824, 53026545299456,-2753673793480966144, 68423881271489019904,-22654998127210332160] |