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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 | 20 |
| 3 | 1680 |
| 4 | 368168 |
| 5 | 166221670 |
| 6 | 134195139015 |
| 7 | 176210700176028 |
| 8 | 351584685612733980 |
[1,20,1680,368168,166221670,134195139015, 176210700176028,351584685612733980] |