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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 7 |
| 6 | 12 |
| 7 | 16 |
| 8 | 26 |
| 9 | 35 |
| 10 | 53 |
| 11 | 70 |
| 12 | 109 |
| 13 | 142 |
| 14 | 217 |
| 15 | 285 |
| 16 | 418 |
| 17 | 548 |
| 18 | 799 |
| 19 | 1029 |
| 20 | 1490 |
[1,1,2,3,5,7,12,16,26,35,53,70,109,142,217,285, 418,548,799,1029,1490] |