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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 8 |
| 6 | 9 |
| 7 | 17 |
| 8 | 26 |
| 9 | 47 |
| 10 | 81 |
| 11 | 142 |
| 12 | 264 |
| 13 | 474 |
| 14 | 883 |
| 15 | 1629 |
| 16 | 3045 |
| 17 | 5735 |
| 18 | 10780 |
| 19 | 20429 |
| 20 | 38688 |
| 21 | 73654 |
| 22 | 140426 |
| 23 | 268341 |
| 24 | 513867 |
| 25 | 986034 |
| 26 | 1894410 |
| 27 | 3646135 |
| 28 | 7027826 |
| 29 | 13562626 |
| 30 | 26208249 |
| 31 | 50698866 |
| 32 | 98184468 |
| 33 | 190338062 |
| 34 | 369326691 |
| 35 | 717271794 |
| 36 | 1394198587 |
| 37 | 2712112562 |
[1,2,3,4,8,9,17,26,47,81,142,264,474,883,1629, 3045,5735,10780,20429,38688,73654,140426,268341, 513867,986034,1894410,3646135,7027826,13562626, 26208249,50698866,98184468,190338062,369326691, 717271794,1394198587,2712112562] |