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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 151 |
| 5 | 302 |
| 6 | 604 |
[1,2,4,151,302,604] |