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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 40 |
| 4 | 0 |
| 5 | 480 |
| 6 | 1232000 |
| 7 | 8320 |
| 8 | 256256000 |
| 9 | 744065052160 |
| 10 | 56972032000 |
| 11 | 933057413785600 |
| 12 | 3248379673651200000 |
| 13 | 1038642349994762240 |
| 14 | 15202354034221486080000 |
| 15 | 62540998641516972945735680 |
[1,0,0,40,0,480,1232000,8320,256256000, 744065052160,56972032000,933057413785600, 3248379673651200000,1038642349994762240, 15202354034221486080000, 62540998641516972945735680] |