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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 | 21 |
| 3 | 142 |
| 4 | 1325 |
| 5 | 13682 |
| 6 | 109702 |
| 7 | 1104476 |
| 8 | 9561346 |
| 9 | 89663745 |
[0,21,142,1325,13682,109702,1104476,9561346, 89663745] |