The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 7 |
| 5 | 13 |
| 6 | 23 |
| 7 | 40 |
| 8 | 69 |
| 9 | 119 |
| 10 | 200 |
| 11 | 335 |
| 12 | 557 |
| 13 | 917 |
| 14 | 1499 |
| 15 | 2433 |
| 16 | 3920 |
| 17 | 6280 |
| 18 | 10004 |
| 19 | 15837 |
| 20 | 24946 |
| 21 | 39087 |
| 22 | 60952 |
| 23 | 94606 |
| 24 | 146203 |
| 25 | 224957 |
[1,1,2,4,7,13,23,40,69,119,200,335,557,917,1499, 2433,3920,6280,10004,15837,24946,39087,60952, 94606,146203,224957] |