The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 25 |
| 5 | 31 |
| 6 | 73 |
| 7 | 37487 |
| 8 | 151968 |
| 9 | 2529733 |
| 10 | 1741375327 |
| 11 | 89777954615 |
[1,1,1,25,31,73,37487,151968,2529733,1741375327, 89777954615] |