The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 167281 |
| 3 | 13349904 |
| 4 | 2745709200 |
| 5 | 1124519007690 |
| 6 | 461326213311625 |
| 7 | 172824721449665640 |
[0,167281,13349904,2745709200,1124519007690, 461326213311625,172824721449665640] |