The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 6 |
| 7 | 11 |
| 8 | 22 |
| 9 | 43 |
| 10 | 87 |
| 11 | 176 |
| 12 | 357 |
| 13 | 732 |
| 14 | 1497 |
| 15 | 3089 |
| 16 | 6335 |
| 17 | 13099 |
| 18 | 26956 |
| 19 | 55779 |
| 20 | 114904 |
| 21 | 237734 |
| 22 | 490096 |
| 23 | 1013276 |
| 24 | 2089105 |
| 25 | 4315487 |
| 26 | 8894624 |
| 27 | 18356468 |
| 28 | 37813944 |
| 29 | 77958972 |
| 30 | 160487953 |
| 31 | 330533009 |
| 32 | 679920989 |
| 33 | 1398944724 |
| 34 | 2875374720 |
| 35 | 5910355198 |
| 36 | 12138248459 |
| 37 | 24927057132 |
| 38 | 51151600936 |
[1,1,1,2,3,6,11,22,43,87,176,357,732,1497,3089, 6335,13099,26956,55779,114904,237734,490096, 1013276,2089105,4315487,8894624,18356468,37813944, 77958972,160487953,330533009,679920989,1398944724, 2875374720,5910355198,12138248459,24927057132, 51151600936] |