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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 | 4 |
| 3 | 22 |
| 4 | 186 |
| 5 | 6317 |
| 6 | 175347 |
| 7 | 15968369 |
| 8 | 2419381757 |
| 9 | 643839941494 |
[1,4,22,186,6317,175347,15968369,2419381757, 643839941494] |