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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | -1 |
| 3 | -1 |
| 4 | -1 |
| 5 | -2 |
| 6 | -1 |
| 7 | 3 |
| 8 | 7 |
| 9 | 8 |
| 10 | 25 |
| 11 | 37 |
| 12 | -47 |
| 13 | -318 |
| 14 | -559 |
| 15 | -2023 |
| 16 | -7039 |
| 17 | 496 |
| 18 | 90431 |
| 19 | 314775 |
| 20 | 1139599 |
| 21 | 8007614 |
| 22 | 13512079 |
| 23 | -154788437 |
| 24 | -1247862041 |
| 25 | -5097732072 |
| 26 | -56844671623 |
| 27 | -290379801907 |
| 28 | 1403230649825 |
| 29 | 32188159859842 |
[1,0,-1,-1,-1,-2,-1,3,7,8,25,37,-47,-318,-559, -2023,-7039,496,90431,314775,1139599,8007614, 13512079,-154788437,-1247862041,-5097732072, -56844671623,-290379801907,1403230649825, 32188159859842] |