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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 28 |
| 3 | 2936 |
| 4 | 851332 |
| 5 | 1661620524 |
| 6 | 15513264742256 |
[4,28,2936,851332,1661620524,15513264742256] |