The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 4 |
| 6 | 5 |
| 7 | 6 |
| 8 | 7 |
| 9 | 8 |
| 10 | 10 |
| 11 | 13 |
| 12 | 19 |
| 13 | 15 |
| 14 | 16 |
| 15 | 27 |
| 16 | 39 |
| 17 | 51 |
| 18 | 67 |
[0,1,2,3,4,5,6,7,8,10,13,19,15,16,27,39,51,67] |