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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | -19 |
| 5 | -64 |
| 6 | 1207 |
| 7 | 5440 |
| 8 | -164071 |
| 9 | -954368 |
| 10 | 39943691 |
| 11 | 284754944 |
| 12 | -15250391099 |
| 13 | -128749666304 |
| 14 | 8402599565375 |
| 15 | 81978198409216 |
| 16 | -6309988001033167 |
| 17 | -69853770233675776 |
| 18 | 6194681665486634899 |
| 19 | 76717804389440684032 |
[1,1,3,4,-19,-64,1207,5440,-164071,-954368, 39943691,284754944,-15250391099,-128749666304, 8402599565375,81978198409216,-6309988001033167, -69853770233675776,6194681665486634899, 76717804389440684032] |