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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 14 |
| 4 | 77 |
| 5 | 475 |
| 6 | 3188 |
| 7 | 22004 |
| 8 | 156230 |
| 9 | 1126536 |
| 10 | 8226592 |
| 11 | 60653744 |
[1,1,3,14,77,475,3188,22004,156230,1126536, 8226592,60653744] |