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