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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 0 |
| 3 | -6 |
| 4 | 36 |
| 5 | -20 |
| 6 | -2730 |
| 7 | 38178 |
| 8 | -93688 |
| 9 | -7711272 |
| 10 | 184968810 |
| 11 | -1036880570 |
| 12 | -66424040628 |
| 13 | 2427958996164 |
| 14 | -24081426198466 |
| 15 | -1271591203182510 |
| 16 | 66942964987695120 |
| 17 | -1027559316530335952 |
| 18 | -45046737788036457006 |
| 19 | 3332345692967904801438 |
[0,1,0,-6,36,-20,-2730,38178,-93688,-7711272, 184968810,-1036880570,-66424040628,2427958996164, -24081426198466,-1271591203182510, 66942964987695120,-1027559316530335952, -45046737788036457006,3332345692967904801438] |