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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 4 |
| 6 | 6 |
| 7 | 9 |
| 8 | 14 |
| 9 | 21 |
| 10 | 31 |
| 11 | 47 |
| 12 | 71 |
| 13 | 106 |
| 14 | 159 |
| 15 | 239 |
| 16 | 358 |
| 17 | 537 |
| 18 | 806 |
| 19 | 1209 |
| 20 | 1813 |
| 21 | 2719 |
| 22 | 4079 |
| 23 | 6119 |
[1,1,1,2,3,4,6,9,14,21,31,47,71,106,159,239,358, 537,806,1209,1813,2719,4079,6119] |