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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 11 |
| 6 | 20 |
| 7 | 36 |
| 8 | 71 |
| 9 | 146 |
| 10 | 260 |
| 11 | 495 |
| 12 | 860 |
| 13 | 1559 |
| 14 | 2831 |
| 15 | 5114 |
[1,2,3,7,11,20,36,71,146,260,495,860,1559,2831, 5114] |