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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 15 |
| 3 | 21 |
| 4 | 171 |
| 5 | 1711 |
[3,15,21,171,1711] |