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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 5 |
| 7 | 7 |
| 8 | 13 |
| 9 | 20 |
| 10 | 35 |
| 11 | 55 |
| 12 | 96 |
| 13 | 156 |
| 14 | 267 |
| 15 | 433 |
| 16 | 747 |
| 17 | 1239 |
| 18 | 2089 |
| 19 | 3498 |
| 20 | 5912 |
[1,1,1,2,3,5,7,13,20,35,55,96,156,267,433,747, 1239,2089,3498,5912] |