The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 2 |
| 7 | 2 |
| 8 | 2 |
| 9 | 3 |
| 10 | 4 |
| 11 | 4 |
| 12 | 5 |
| 13 | 6 |
| 14 | 7 |
| 15 | 9 |
| 16 | 10 |
| 17 | 11 |
| 18 | 14 |
| 19 | 17 |
| 20 | 20 |
| 21 | 24 |
| 22 | 29 |
| 23 | 35 |
| 24 | 40 |
| 25 | 48 |
| 26 | 55 |
[1,1,1,1,1,1,2,2,2,3,4,4,5,6,7,9,10,11,14,17,20, 24,29,35,40,48,55] |