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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 | 10 |
| 3 | 12 |
| 4 | 20160 |
| 5 | 15713280 |
| 6 | 137592000 |
| 7 | 44289146880 |
[1,10,12,20160,15713280,137592000,44289146880] |