The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 9 |
| 5 | 91 |
| 6 | 1110627 |
| 7 | 2340346013551 |
| 8 | 1153990596161360976412397283 |
| 9 | 4046008078695782327150934410204261346038863974869654053 |
[1,1,1,9,91,1110627,2340346013551, 1153990596161360976412397283, 40460080786957823271509344102042613460388639748696\ 54053] |