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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 40 |
| 4 | 1564 |
| 5 | 497400 |
| 6 | 1187052462 |
[0,2,40,1564,497400,1187052462] |