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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 8 |
| 6 | 13 |
| 7 | 24 |
| 8 | 40 |
| 9 | 69 |
| 10 | 130 |
| 11 | 231 |
| 12 | 408 |
| 13 | 689 |
| 14 | 1272 |
| 15 | 2153 |
| 16 | 3960 |
| 17 | 6993 |
| 18 | 12560 |
[1,2,3,5,8,13,24,40,69,130,231,408,689,1272,2153, 3960,6993,12560] |