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 | 1 |
| 8 | 1 |
| 9 | 3 |
| 10 | 10 |
| 11 | 25 |
| 12 | 95 |
| 13 | 366 |
| 14 | 1433 |
| 15 | 5802 |
| 16 | 24105 |
| 17 | 102479 |
| 18 | 445577 |
| 19 | 1992044 |
[0,0,0,0,0,0,1,1,3,10,25,95,366,1433,5802,24105, 102479,445577,1992044] |