The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 336 |
| 3 | 80510976 |
| 4 | 4632013631072036192256 |
| 5 | 9259244309598002961669050091730162686136971834955923456 |
[1,3,336,80510976,4632013631072036192256, 92592443095980029616690500917301626861369718349559\ 23456] |