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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 29 |
| 6 | 114 |
| 7 | 578 |
| 8 | 2890 |
| 9 | 15431 |
| 10 | 82091 |
| 11 | 442702 |
| 12 | 2377819 |
| 13 | 12820705 |
[1,1,3,7,29,114,578,2890,15431,82091,442702, 2377819,12820705] |