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