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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -4 |
| 3 | 25 |
| 4 | -173 |
| 5 | 1292 |
| 6 | -10105 |
| 7 | 81565 |
| 8 | -673691 |
| 9 | 5662878 |
| 10 | -48263038 |
| 11 | 415950272 |
| 12 | -3617999891 |
| 13 | 31714089336 |
| 14 | -279828926113 |
| 15 | 2483097203637 |
| 16 | -22143011361045 |
| 17 | 198317403322755 |
[1,1,-4,25,-173,1292,-10105,81565,-673691,5662878, -48263038,415950272,-3617999891,31714089336, -279828926113,2483097203637,-22143011361045, 198317403322755] |