The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 0 |
| 8 | 1 |
| 9 | 2 |
| 10 | 3 |
| 11 | 6 |
| 12 | 17 |
| 13 | 37 |
| 14 | 98 |
| 15 | 275 |
| 16 | 797 |
| 17 | 2414 |
| 18 | 7613 |
| 19 | 24510 |
| 20 | 80721 |
| 21 | 270018 |
| 22 | 915034 |
[1,0,1,2,3,6,17,37,98,275,797,2414,7613,24510, 80721,270018,915034] |