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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 5 |
| 6 | 10 |
| 7 | 20 |
| 8 | 42 |
| 9 | 102 |
| 10 | 276 |
| 11 | 857 |
| 12 | 3233 |
| 13 | 15113 |
| 14 | 91717 |
| 15 | 751479 |
[1,1,2,3,5,10,20,42,102,276,857,3233,15113,91717, 751479] |