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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 | 0 |
| 2 | 0 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 1800 |
| 7 | 20160 |
| 8 | 221760 |
| 9 | 3507840 |
| 10 | 59875200 |
| 11 | 1037836800 |
| 12 | 20776694400 |
| 13 | 459761702400 |
| 14 | 10686605529600 |
| 15 | 268901439206400 |
| 16 | 7318617546240000 |
| 17 | 210804082384896000 |
| 18 | 6440850193262284800 |
| 19 | 209115023566972723200 |
| 20 | 7157303732396353536000 |
| 21 | 257535328655939862528000 |
[1,0,0,6,24,120,1800,20160,221760,3507840, 59875200,1037836800,20776694400,459761702400, 10686605529600,268901439206400,7318617546240000, 210804082384896000,6440850193262284800, 209115023566972723200,7157303732396353536000, 257535328655939862528000] |