The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 4 |
| 5 | 6 |
| 6 | 8 |
| 7 | 10 |
| 8 | 13 |
| 9 | 16 |
| 10 | 19 |
| 11 | 23 |
| 12 | 27 |
| 13 | 32 |
| 14 | 35 |
| 15 | 41 |
| 16 | 45 |
| 17 | 52 |
| 18 | 57 |
[0,1,3,4,6,8,10,13,16,19,23,27,32,35,41,45,52,57] |