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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | -3 |
| 4 | 0 |
| 5 | 0 |
| 6 | 210 |
| 7 | -1260 |
| 8 | 3752 |
| 9 | -46872 |
| 10 | 690960 |
| 11 | -6013920 |
| 12 | 58389672 |
| 13 | -895065600 |
| 14 | 12888358392 |
| 15 | -168411308520 |
| 16 | 2621915506688 |
| 17 | -47022586623488 |
| 18 | 824126273574336 |
| 19 | -14767693271763840 |
| 20 | 293589445235224960 |
[1,0,1,-3,0,0,210,-1260,3752,-46872,690960, -6013920,58389672,-895065600,12888358392, -168411308520,2621915506688,-47022586623488, 824126273574336,-14767693271763840, 293589445235224960] |