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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 1 |
| 4 | 8 |
| 5 | 0 |
| 6 | 14 |
| 7 | 78 |
| 8 | 0 |
| 9 | 22 |
| 10 | 213 |
| 11 | 944 |
| 12 | 0 |
| 13 | 0 |
| 14 | 529 |
| 15 | 3400 |
| 16 | 13800 |
| 17 | 0 |
| 18 | 0 |
[1,1,8,0,14,78,0,22,213,944,0,0,529,3400,13800,0, 0] |