The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 7 |
| 6 | 62 |
| 7 | 651 |
| 8 | 10227 |
| 9 | 260144 |
| 10 | 11878410 |
| 11 | 1017605477 |
| 12 | 165072063493 |
| 13 | 50501705362177 |
| 14 | 29054148751458689 |
[0,0,0,1,7,62,651,10227,260144,11878410, 1017605477,165072063493,50501705362177, 29054148751458689] |