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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 173844 |
| 5 | 19160064 |
| 6 | 880051392 |
| 7 | 22403386368 |
| 8 | 369973554588 |
| 9 | 4389044453376 |
| 10 | 40112660250432 |
| 11 | 296843683018752 |
| 12 | 1845359227400436 |
| 13 | 9910421386905600 |
| 14 | 46986241061327040 |
| 15 | 200074070639950848 |
[1,0,0,0,173844,19160064,880051392,22403386368, 369973554588,4389044453376,40112660250432, 296843683018752,1845359227400436,9910421386905600, 46986241061327040,200074070639950848] |