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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 2 |
| 4 | 0 |
| 5 | 6 |
| 6 | 34 |
| 7 | 952 |
| 8 | 0 |
| 9 | 1 |
| 10 | 12 |
| 11 | 6 |
| 12 | 181 |
| 13 | 283 |
| 14 | 13333 |
| 15 | 31839187 |
[0,0,2,0,6,34,952,0,1,12,6,181,283,13333,31839187] |