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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 20 |
| 3 | 1680 |
| 4 | 369600 |
| 5 | 167262000 |
| 6 | 135190246573 |
| 7 | 177591503329934 |
| 8 | 354324970027942152 |
[1,1,20,1680,369600,167262000,135190246573, 177591503329934,354324970027942152] |