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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 1 |
| 3 | -120 |
| 4 | 1056496 |
| 5 | -2063348839223 |
| 6 | 1457689055077930674637 |
| 7 | -569779896381467292745562607320194 |
| 8 | 174622933743914766946635359968704455433117668396 |
| 9 | -56466564044341292662007179162722871704054012257606338926938133618 |
[1,-1,1,-120,1056496,-2063348839223, 1457689055077930674637, -569779896381467292745562607320194, 174622933743914766946635359968704455433117668396, -5646656404434129266200717916272287170405401225760\ 6338926938133618] |