The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 580 |
| 3 | 19546975 |
| 4 | 11012437532800 |
| 5 | 53461314050652508000 |
| 6 | 1482500191777802616831698000 |
| 7 | 177485739636656023698217362159890000 |
| 8 | 74896615128945574656737417426177604440960000 |
[1,580,19546975,11012437532800, 53461314050652508000,1482500191777802616831698000, 177485739636656023698217362159890000, 74896615128945574656737417426177604440960000] |