The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 16 |
| 6 | 58 |
| 7 | 116 |
| 8 | 232 |
| 9 | 464 |
| 10 | 1690 |
| 11 | 3380 |
| 12 | 6760 |
| 13 | 24712 |
| 14 | 49424 |
| 15 | 98848 |
| 16 | 361258 |
| 17 | 722516 |
| 18 | 1445032 |
| 19 | 5280576 |
| 20 | 10561152 |
| 21 | 21122304 |
| 22 | 77188216 |
[1,2,4,8,16,58,116,232,464,1690,3380,6760,24712, 49424,98848,361258,722516,1445032,5280576, 10561152,21122304,77188216] |