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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 2 |
| 3 | 31 |
| 4 | 1781 |
| 5 | 58180 |
[1,0,2,31,1781,58180] |