The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 8 |
| 5 | 15 |
| 6 | 25 |
| 7 | 44 |
| 8 | 76 |
| 9 | 130 |
| 10 | 225 |
| 11 | 386 |
| 12 | 664 |
| 13 | 1142 |
| 14 | 1963 |
| 15 | 3375 |
| 16 | 5800 |
| 17 | 9970 |
| 18 | 17136 |
| 19 | 29454 |
| 20 | 50625 |
| 21 | 87012 |
| 22 | 149555 |
| 23 | 257051 |
| 24 | 441812 |
| 25 | 759375 |
| 26 | 1305192 |
| 27 | 2243328 |
| 28 | 3855769 |
| 29 | 6627188 |
| 30 | 11390625 |
| 31 | 19577886 |
| 32 | 33649921 |
[1,1,2,5,8,15,25,44,76,130,225,386,664,1142,1963, 3375,5800,9970,17136,29454,50625,87012,149555, 257051,441812,759375,1305192,2243328,3855769, 6627188,11390625,19577886,33649921] |