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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 52 |
| 9 | 254 |
| 10 | 1061 |
| 11 | 4586 |
| 12 | 28708 |
| 13 | 218507 |
| 14 | 1736540 |
| 15 | 17357415 |
| 16 | 205447067 |
| 17 | 2686619638 |
[1,7,19,52,254,1061,4586,28708,218507,1736540, 17357415,205447067,2686619638] |