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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 | 20 |
| 4 | 246 |
| 5 | 6587 |
| 6 | 330041 |
| 7 | 36098316 |
| 8 | 7888993357 |
| 9 | 3400193363030 |
[1,2,20,246,6587,330041,36098316,7888993357, 3400193363030] |