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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | 2 |
| 9 | 6 |
| 10 | 14 |
| 11 | 37 |
| 12 | 88 |
| 13 | 218 |
| 14 | 515 |
| 15 | 1226 |
| 16 | 2848 |
| 17 | 6566 |
| 18 | 14997 |
| 19 | 33483 |
| 20 | 74406 |
| 21 | 162422 |
| 22 | 351621 |
| 23 | 751171 |
| 24 | 1594028 |
[1,2,6,14,37,88,218,515,1226,2848,6566,14997, 33483,74406,162422,351621,751171,1594028] |