The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 7 |
| 5 | 10 |
| 6 | 15 |
| 7 | 24 |
| 8 | 34 |
| 9 | 52 |
| 10 | 82 |
| 11 | 116 |
| 12 | 180 |
| 13 | 280 |
| 14 | 396 |
| 15 | 616 |
[1,2,3,4,7,10,15,24,34,52,82,116,180,280,396,616] |