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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 | 6 |
| 3 | 11 |
| 4 | 61 |
| 5 | 664 |
| 6 | 63663 |
| 7 | 109753135 |
[1,6,11,61,664,63663,109753135] |