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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 | 4 |
| 3 | 9 |
| 4 | 232 |
| 5 | 2636 |
| 6 | 198753 |
| 7 | 50126162 |
| 8 | 17703574257 |
| 9 | 28274774976231 |
[1,4,9,232,2636,198753,50126162,17703574257, 28274774976231] |