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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 66215680 |
| 6 | 29652406400 |
| 7 | 9656241557760 |
| 8 | 2346647121371952 |
| 9 | 439880319919054080 |
| 10 | 65294456333101261440 |
| 11 | 7838161222769040003840 |
| 12 | 774188816874234585880320 |
| 13 | 63831272413784249623288320 |
[1,0,0,0,0,66215680,29652406400,9656241557760, 2346647121371952,439880319919054080, 65294456333101261440,7838161222769040003840, 774188816874234585880320, 63831272413784249623288320] |