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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | -1 |
| 2 | 1 |
| 3 | -31 |
| 4 | 421 |
| 5 | -19531 |
| 6 | 873841 |
| 7 | -67417351 |
| 8 | 6079224061 |
| 9 | -745862759491 |
| 10 | 109749390119881 |
| 11 | -20006355219508351 |
| 12 | 4313763491717212501 |
| 13 | -1101230418170874812731 |
| 14 | 326019382476444960095521 |
| 15 | -111246859639685180908387831 |
| 16 | 43247270290320815515213664941 |
[0,-1,1,-31,421,-19531,873841,-67417351, 6079224061,-745862759491,109749390119881, -20006355219508351,4313763491717212501, -1101230418170874812731,326019382476444960095521, -111246859639685180908387831, 43247270290320815515213664941] |