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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 | 1 |
| 3 | 8 |
| 4 | 381 |
| 5 | 252080 |
| 6 | 18687541309 |
[1,0,1,8,381,252080,18687541309] |