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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 9 |
| 5 | 12 |
| 6 | 17 |
| 7 | 23 |
| 8 | 26 |
| 9 | 51 |
| 10 | 113 |
| 11 | 236 |
| 12 | 509 |
| 13 | 1659 |
| 14 | 2769 |
| 15 | 5258 |
| 16 | 8456 |
| 17 | 8787 |
| 18 | 11487 |
| 19 | 19367 |
| 20 | 28094 |
| 21 | 36114 |
| 22 | 69663 |
| 23 | 115697 |
[1,2,8,9,12,17,23,26,51,113,236,509,1659,2769, 5258,8456,8787,11487,19367,28094,36114,69663, 115697] |