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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 13 |
| 6 | 37 |
| 7 | 181 |
| 8 | 1229 |
| 9 | 8379 |
| 10 | 80551 |
| 11 | 1100805 |
| 12 | 17145265 |
| 13 | 351104244 |
| 14 | 9283888557 |
| 15 | 306284314214 |
[1,13,37,181,1229,8379,80551,1100805,17145265, 351104244,9283888557,306284314214] |