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 | 365 |
| 14 | 1432 |
| 15 | 5799 |
| 16 | 24092 |
| 17 | 102413 |
| 18 | 445363 |
| 19 | 1991320 |
[0,0,0,0,0,0,1,1,3,10,25,95,365,1432,5799,24092, 102413,445363,1991320] |