The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 5 |
| 3 | 9 |
| 4 | 18 |
| 5 | 36 |
| 6 | 71 |
| 7 | 138 |
| 8 | 268 |
| 9 | 522 |
| 10 | 1017 |
| 11 | 1980 |
| 12 | 3853 |
| 13 | 7498 |
| 14 | 14594 |
| 15 | 28406 |
| 16 | 55287 |
| 17 | 107604 |
| 18 | 209428 |
| 19 | 407608 |
| 20 | 793325 |
| 21 | 1544042 |
| 22 | 3005154 |
| 23 | 5848902 |
| 24 | 11383662 |
| 25 | 22155913 |
| 26 | 43121842 |
| 27 | 83927627 |
| 28 | 163347533 |
| 29 | 317921733 |
| 30 | 618768013 |
| 31 | 1204302235 |
| 32 | 2343921860 |
| 33 | 4561952576 |
[1,3,5,9,18,36,71,138,268,522,1017,1980,3853,7498, 14594,28406,55287,107604,209428,407608,793325, 1544042,3005154,5848902,11383662,22155913, 43121842,83927627,163347533,317921733,618768013, 1204302235,2343921860,4561952576] |