The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 2 |
| 6 | 4 |
| 7 | 4 |
| 8 | 6 |
| 9 | 8 |
| 10 | 11 |
| 11 | 12 |
| 12 | 19 |
| 13 | 21 |
| 14 | 27 |
| 15 | 34 |
| 16 | 45 |
| 17 | 51 |
| 18 | 69 |
| 19 | 77 |
| 20 | 100 |
| 21 | 117 |
| 22 | 146 |
[1,1,1,2,2,4,4,6,8,11,12,19,21,27,34,45,51,69,77, 100,117,146] |