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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 32 |
| 5 | 122 |
| 6 | 388 |
| 7 | 1580 |
| 8 | 2302 |
| 9 | 3436 |
| 10 | 3866 |
| 11 | 16993 |
| 12 | 35263 |
| 13 | 42601 |
| 14 | 51251 |
[1,2,4,32,122,388,1580,2302,3436,3866,16993,35263, 42601,51251] |