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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | -3 |
| 3 | 5 |
| 4 | 29 |
| 5 | -181 |
| 6 | -401 |
| 7 | 9645 |
| 8 | -14183 |
| 9 | -689257 |
| 10 | 4826171 |
| 11 | 55700633 |
| 12 | -1024570955 |
| 13 | -2770525005 |
| 14 | 221566919911 |
| 15 | -1028838834811 |
| 16 | -49439771820367 |
| 17 | 723165789334703 |
| 18 | 9903852025111027 |
| 19 | -362150510124039471 |
| 20 | -463774017017434739 |
| 21 | 169793689786411161995 |
[1,0,-3,5,29,-181,-401,9645,-14183,-689257, 4826171,55700633,-1024570955,-2770525005, 221566919911,-1028838834811,-49439771820367, 723165789334703,9903852025111027, -362150510124039471,-463774017017434739, 169793689786411161995] |