The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 5 |
| 5 | 7 |
| 6 | 8 |
| 7 | 10 |
| 8 | 13 |
| 9 | 15 |
| 10 | 16 |
| 11 | 20 |
| 12 | 23 |
| 13 | 25 |
| 14 | 28 |
| 15 | 31 |
| 16 | 32 |
| 17 | 37 |
| 18 | 39 |
| 19 | 40 |
| 20 | 47 |
| 21 | 52 |
| 22 | 55 |
| 23 | 58 |
| 24 | 60 |
| 25 | 63 |
[1,2,4,5,7,8,10,13,15,16,20,23,25,28,31,32,37,39, 40,47,52,55,58,60,63] |