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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 14 |
| 4 | 45 |
| 5 | 107 |
| 6 | 138 |
| 7 | 276 |
| 8 | 414 |
| 9 | 1135 |
| 10 | 2270 |
| 11 | 6672 |
| 12 | 12209 |
| 13 | 18881 |
| 14 | 180865 |
[1,2,14,45,107,138,276,414,1135,2270,6672,12209, 18881,180865] |