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A204247 as a simple table

na(n)
11
20
3-1
4-8
5-204
6-24768
7-17867520
8-90077184000
9-3632037470208000
10-1317998813773824000000
11-4782755930355924782284800000
12-190912318579437962454242426880000000

[1,0,-1,-8,-204,-24768,-17867520,-90077184000,
 -3632037470208000,-1317998813773824000000,
 -4782755930355924782284800000,
 -190912318579437962454242426880000000]