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A179936 as a simple table

na(n)
11
20
36
40
5540
60
7156240
80
996480720
100
11104661849600
120
13177947471782080
140
15439942718370355200
160
171499983925770422892800
180
196780179728814814933811200
200
2139412342523061395825857920000
220

[1,0,6,0,540,0,156240,0,96480720,0,104661849600,0,
 177947471782080,0,439942718370355200,0,
 1499983925770422892800,0,
 6780179728814814933811200,0,
 39412342523061395825857920000,0]