The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 13 |
| 5 | 29 |
| 6 | 64 |
| 7 | 137 |
| 8 | 285 |
| 9 | 584 |
| 10 | 1197 |
| 11 | 2479 |
| 12 | 5198 |
| 13 | 10989 |
| 14 | 23275 |
| 15 | 49122 |
| 16 | 102951 |
| 17 | 213915 |
| 18 | 440478 |
| 19 | 899177 |
| 20 | 1821577 |
| 21 | 3668080 |
| 22 | 7358199 |
| 23 | 14742653 |
| 24 | 29582240 |
| 25 | 59593613 |
| 26 | 120742119 |
| 27 | 246254254 |
| 28 | 505494077 |
| 29 | 1043327165 |
| 30 | 2161750892 |
| 31 | 4488143133 |
| 32 | 9319949375 |
| 33 | 19326922734 |
[1,3,6,13,29,64,137,285,584,1197,2479,5198,10989, 23275,49122,102951,213915,440478,899177,1821577, 3668080,7358199,14742653,29582240,59593613, 120742119,246254254,505494077,1043327165, 2161750892,4488143133,9319949375,19326922734] |