The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 14 |
| 5 | 26 |
| 6 | 48 |
| 7 | 88 |
| 8 | 154 |
| 9 | 278 |
| 10 | 500 |
| 11 | 900 |
| 12 | 1576 |
| 13 | 2806 |
| 14 | 4996 |
| 15 | 8894 |
| 16 | 15564 |
| 17 | 27538 |
| 18 | 48726 |
| 19 | 86212 |
| 20 | 150792 |
| 21 | 265730 |
| 22 | 468342 |
| 23 | 825462 |
| 24 | 1442866 |
| 25 | 2535802 |
| 26 | 4457332 |
| 27 | 7835308 |
| 28 | 13687192 |
| 29 | 24008300 |
| 30 | 42118956 |
| 31 | 73895808 |
| 32 | 129012260 |
| 33 | 225966856 |
| 34 | 395842772 |
| 35 | 693470658 |
| 36 | 1210093142 |
| 37 | 2117089488 |
| 38 | 3704400974 |
[1,2,4,8,14,26,48,88,154,278,500,900,1576,2806, 4996,8894,15564,27538,48726,86212,150792,265730, 468342,825462,1442866,2535802,4457332,7835308, 13687192,24008300,42118956,73895808,129012260, 225966856,395842772,693470658,1210093142, 2117089488,3704400974] |