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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -44 |
| 3 | -24 |
| 4 | 1341 |
| 5 | 1755 |
| 6 | -21538 |
| 7 | -89654 |
| 8 | 215873 |
| 9 | 1978283 |
| 10 | 4362946 |
| 11 | -41493994 |
| 12 | -146595004 |
| 13 | 199773652 |
| 14 | 4332900506 |
| 15 | 399542726 |
| 16 | -31367063828 |
| 17 | -291436749508 |
| 18 | 599072094382 |
| 19 | 2087538126074 |
| 20 | 21203843886148 |
| 21 | -108990928314404 |
[1,-1,-44,-24,1341,1755,-21538,-89654,215873, 1978283,4362946,-41493994,-146595004,199773652, 4332900506,399542726,-31367063828,-291436749508, 599072094382,2087538126074,21203843886148, -108990928314404] |