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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 1 |
| 7 | 8 |
| 8 | 36 |
| 9 | 269 |
| 10 | 2418 |
| 11 | 29216 |
| 12 | 458445 |
| 13 | 9373692 |
| 14 | 249530113 |
[0,0,0,0,1,1,8,36,269,2418,29216,458445,9373692, 249530113] |