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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 23 |
| 4 | 181 |
| 5 | 2706 |
| 6 | 73791 |
| 7 | 3327225 |
| 8 | 267114439 |
| 9 | 38448796541 |
[1,5,23,181,2706,73791,3327225,267114439, 38448796541] |