The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 9 |
| 4 | 342 |
| 5 | 26670 |
| 6 | 1960515 |
| 7 | 199230213 |
| 8 | 17543249724 |
| 9 | 1392949344564 |
| 10 | 103992753869385 |
| 11 | 7125947800456375 |
| 12 | 447172658110001142 |
| 13 | 26218227869348323614 |
| 14 | 1476897053364550626991 |
| 15 | 80893894777513364496600 |
[1,9,342,26670,1960515,199230213,17543249724, 1392949344564,103992753869385,7125947800456375, 447172658110001142,26218227869348323614, 1476897053364550626991,80893894777513364496600] |