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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 11 |
| 6 | 18 |
| 7 | 34 |
| 8 | 55 |
| 9 | 89 |
| 10 | 144 |
| 11 | 246 |
| 12 | 398 |
| 13 | 665 |
| 14 | 1076 |
| 15 | 1775 |
| 16 | 2872 |
| 17 | 4647 |
| 18 | 7519 |
| 19 | 12255 |
[1,2,3,5,11,18,34,55,89,144,246,398,665,1076,1775, 2872,4647,7519,12255] |