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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 105 |
| 3 | 126 |
| 4 | 4893 |
| 5 | 168756 |
[21,105,126,4893,168756] |