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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 | 1 |
| 3 | 4 |
| 4 | 20 |
| 5 | 346 |
| 6 | 6891 |
| 7 | 634172 |
| 8 | 47917598 |
| 9 | 27622729933 |
| 10 | 6998287399637 |
[0,1,4,20,346,6891,634172,47917598,27622729933, 6998287399637] |