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A189839 as a simple table

na(n)
11
22
36
420
580
6384
72112
812992
994272
10716800
116141440
1258451568
13596647568
146555879072
1577766001056
16981202169600

[1,2,6,20,80,384,2112,12992,94272,716800,6141440,
 58451568,596647568,6555879072,77766001056,
 981202169600]