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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 | 9 |
| 3 | 80 |
| 4 | 656 |
| 5 | 4180 |
| 6 | 68080 |
| 7 | 1643372 |
| 8 | 58423188 |
| 9 | 3045734096 |
| 10 | 235680645520 |
| 11 | 26923774835716 |
| 12 | 4558306996574952 |
[1,9,80,656,4180,68080,1643372,58423188, 3045734096,235680645520,26923774835716, 4558306996574952] |