The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 6 |
| 7 | 7 |
| 8 | 8 |
| 9 | 9 |
| 10 | 11 |
| 11 | 13 |
| 12 | 14 |
| 13 | 15 |
| 14 | 19 |
| 15 | 20 |
| 16 | 23 |
| 17 | 24 |
| 18 | 25 |
| 19 | 31 |
| 20 | 32 |
| 21 | 47 |
[1,2,3,4,5,6,7,8,9,11,13,14,15,19,20,23,24,25,31, 32,47] |