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