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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | -2 |
| 4 | -22 |
| 5 | -134 |
| 6 | -418 |
| 7 | 1044 |
| 8 | 35352 |
| 9 | 371256 |
| 10 | 2662872 |
| 11 | 2256 |
| 12 | -348450672 |
| 13 | -7383337584 |
| 14 | -85166363280 |
| 15 | -224652273504 |
| 16 | 17983453809024 |
| 17 | 500248545941376 |
| 18 | 7414246148833152 |
| 19 | 13911378371907840 |
| 20 | -2620344425592796416 |
| 21 | -85017815816225598720 |
| 22 | -1321651042532303189760 |
[1,1,1,-2,-22,-134,-418,1044,35352,371256,2662872, 2256,-348450672,-7383337584,-85166363280, -224652273504,17983453809024,500248545941376, 7414246148833152,13911378371907840, -2620344425592796416,-85017815816225598720, -1321651042532303189760] |