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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 | 1 |
| 3 | 2 |
| 4 | 12 |
| 5 | 21840 |
| 6 | 2814355154336774377799951925175856161820370339122436787831200 |
[1,1,2,12,21840, 28143551543367743777999519251758561618203703391224\ 36787831200] |