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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 17 |
| 5 | 37 |
| 6 | 86 |
| 7 | 199 |
| 8 | 475 |
| 9 | 1138 |
| 10 | 2769 |
| 11 | 6748 |
| 12 | 16613 |
| 13 | 40904 |
| 14 | 101317 |
| 15 | 251401 |
| 16 | 624958 |
| 17 | 1555940 |
| 18 | 3882708 |
| 19 | 9701790 |
| 20 | 24276866 |
| 21 | 60817940 |
| 22 | 152508653 |
| 23 | 382828565 |
| 24 | 961859364 |
| 25 | 2418662434 |
| 26 | 6086480305 |
| 27 | 15327208770 |
| 28 | 38622901484 |
| 29 | 97384378728 |
| 30 | 245686368946 |
| 31 | 620158662562 |
[1,2,4,8,17,37,86,199,475,1138,2769,6748,16613, 40904,101317,251401,624958,1555940,3882708, 9701790,24276866,60817940,152508653,382828565, 961859364,2418662434,6086480305,15327208770, 38622901484,97384378728,245686368946,620158662562] |