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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 | 81 |
| 3 | 2646 |
| 4 | 43556 |
| 5 | 476120 |
| 6 | 3785410 |
[1,81,2646,43556,476120,3785410] |