The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 357 |
| 4 | 442285 |
| 5 | 1548940233 |
| 6 | 12959331192279 |
| 7 | 218375094825289861 |
[1,3,357,442285,1548940233,12959331192279, 218375094825289861] |