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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | -1 |
| 3 | 8 |
| 4 | -30 |
| 5 | 366 |
| 6 | -2655 |
| 7 | 41652 |
| 8 | -514668 |
| 9 | 9980586 |
| 10 | -173007765 |
| 11 | 4004890848 |
| 12 | -89829444474 |
| 13 | 2436388004358 |
| 14 | -66690826525323 |
| 15 | 2084372053480332 |
| 16 | -67131989795427480 |
| 17 | 2384198449214048082 |
| 18 | -88073922412026784233 |
[0,2,-1,8,-30,366,-2655,41652,-514668,9980586, -173007765,4004890848,-89829444474,2436388004358, -66690826525323,2084372053480332, -67131989795427480,2384198449214048082, -88073922412026784233] |