The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 35 |
| 4 | 4785 |
| 5 | 440660 |
| 6 | 14245030 |
| 7 | 231475447 |
| 8 | 2383699176 |
| 9 | 17770342627 |
[0,0,35,4785,440660,14245030,231475447,2383699176, 17770342627] |