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 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 1 |
| 10 | 1 |
| 11 | 2 |
| 12 | 1 |
| 13 | 2 |
| 14 | 0 |
| 15 | 7 |
| 16 | 1 |
| 17 | 3 |
| 18 | 5 |
| 19 | 1 |
| 20 | 4 |
| 21 | 4 |
| 22 | 6 |
| 23 | 4 |
| 24 | 13 |
| 25 | 4 |
| 26 | 17 |
| 27 | 13 |
| 28 | 8 |
| 29 | 2 |
| 30 | 20 |
[0,0,0,0,0,0,0,0,1,1,2,1,2,0,7,1,3,5,1,4,4,6,4,13, 4,17,13,8,2,20] |