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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -2 |
| 3 | -8 |
| 4 | 1 |
| 5 | 61 |
| 6 | 91 |
| 7 | -377 |
| 8 | -1469 |
| 9 | 1027 |
| 10 | 16120 |
| 11 | 18250 |
| 12 | -132065 |
| 13 | -427517 |
| 14 | 620062 |
| 15 | 5707648 |
| 16 | 3746683 |
| 17 | -55581941 |
| 18 | -144227438 |
| 19 | 351490672 |
| 20 | 2274331579 |
| 21 | 278638399 |
| 22 | -25348074713 |
| 23 | -50842003745 |
| 24 | 195685236757 |
| 25 | 957135268261 |
| 26 | -459626168864 |
| 27 | -12027281377922 |
[1,1,-2,-8,1,61,91,-377,-1469,1027,16120,18250, -132065,-427517,620062,5707648,3746683,-55581941, -144227438,351490672,2274331579,278638399, -25348074713,-50842003745,195685236757, 957135268261,-459626168864,-12027281377922] |