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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 7 |
| 4 | 13 |
| 5 | 58 |
| 6 | 129 |
| 7 | 253 |
| 8 | 1657 |
| 9 | 2244 |
| 10 | 2437 |
| 11 | 7924 |
| 12 | 9903 |
| 13 | 11899 |
| 14 | 18157 |
| 15 | 18957 |
| 16 | 23665 |
| 17 | 105609 |
[0,1,7,13,58,129,253,1657,2244,2437,7924,9903, 11899,18157,18957,23665,105609] |