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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 7 |
| 4 | 13 |
| 5 | 25 |
| 6 | 47 |
| 7 | 88 |
| 8 | 166 |
| 9 | 313 |
| 10 | 589 |
| 11 | 1109 |
| 12 | 2089 |
| 13 | 3934 |
| 14 | 7408 |
| 15 | 13951 |
| 16 | 26273 |
| 17 | 49477 |
| 18 | 93175 |
| 19 | 175468 |
| 20 | 330442 |
| 21 | 622289 |
| 22 | 1171897 |
| 23 | 2206921 |
| 24 | 4156081 |
| 25 | 7826746 |
| 26 | 14739356 |
| 27 | 27757207 |
| 28 | 52272469 |
| 29 | 98439697 |
| 30 | 185381983 |
| 31 | 349112000 |
| 32 | 657448942 |
| 33 | 1238110153 |
[1,2,4,7,13,25,47,88,166,313,589,1109,2089,3934, 7408,13951,26273,49477,93175,175468,330442,622289, 1171897,2206921,4156081,7826746,14739356,27757207, 52272469,98439697,185381983,349112000,657448942, 1238110153] |