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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 5 |
| 6 | 15 |
| 7 | 18 |
| 8 | 35 |
| 9 | 42 |
[1,5,15,18,35,42] |