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| n | a(n) |
|---|---|
| 5 | 2 |
| 6 | 5 |
| 7 | 7 |
| 8 | 12 |
| 9 | 20 |
| 10 | 33 |
| 11 | 52 |
| 12 | 86 |
| 13 | 137 |
| 14 | 222 |
| 15 | 353 |
| 16 | 568 |
| 17 | 900 |
| 18 | 1433 |
| 19 | 2260 |
| 20 | 3574 |
[2,5,7,12,20,33,52,86,137,222,353,568,900,1433, 2260,3574] |