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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 | 1 |
| 3 | 6 |
| 4 | 45 |
| 5 | 134 |
| 6 | 872 |
[0,1,6,45,134,872] |