The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 15 |
| 5 | 29 |
| 6 | 55 |
| 7 | 105 |
| 8 | 197 |
| 9 | 367 |
| 10 | 678 |
| 11 | 1261 |
| 12 | 2326 |
| 13 | 4293 |
| 14 | 7902 |
| 15 | 14431 |
| 16 | 26363 |
| 17 | 47899 |
[2,2,4,8,15,29,55,105,197,367,678,1261,2326,4293, 7902,14431,26363,47899] |