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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 2 |
| 3 | 6 |
| 4 | 48 |
| 5 | 480 |
| 6 | 5760 |
| 7 | 80640 |
| 8 | 1290240 |
| 9 | 23224320 |
| 10 | 464486400 |
| 11 | 10218700800 |
| 12 | 245248819200 |
| 13 | 6376469299200 |
| 14 | 178541140377600 |
| 15 | 5356234211328000 |
| 16 | 171399494762496000 |
| 17 | 5827582821924864000 |
| 18 | 209792981589295104000 |
[0,0,2,6,48,480,5760,80640,1290240,23224320, 464486400,10218700800,245248819200,6376469299200, 178541140377600,5356234211328000, 171399494762496000,5827582821924864000, 209792981589295104000] |