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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 9 |
| 5 | 31 |
| 6 | 115 |
| 7 | 474 |
| 8 | 2097 |
| 9 | 9967 |
| 10 | 50315 |
| 11 | 268442 |
| 12 | 1505463 |
| 13 | 8840306 |
| 14 | 54169431 |
[1,1,3,9,31,115,474,2097,9967,50315,268442, 1505463,8840306,54169431] |