The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 2 |
| 4 | 2 |
| 5 | 4 |
| 6 | 2 |
| 7 | 3 |
| 8 | 4 |
| 9 | 5 |
| 10 | 5 |
| 11 | 6 |
| 12 | 6 |
| 13 | 6 |
| 14 | 6 |
| 15 | 9 |
| 16 | 9 |
| 17 | 9 |
| 18 | 10 |
| 19 | 10 |
| 20 | 11 |
| 21 | 11 |
| 22 | 13 |
| 23 | 12 |
| 24 | 13 |
| 25 | 13 |
| 26 | 14 |
| 27 | 14 |
| 28 | 14 |
[0,0,2,2,4,2,3,4,5,5,6,6,6,6,9,9,9,10,10,11,11,13, 12,13,13,14,14,14] |