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A032107 as a simple table

na(n)
12
24
324
4192
51920
623040
7322560
85160960
992897280
101857945600
1140874803200
12980995276800
1325505877196800
14714164561510400
1521424936845312000
16685597979049984000
1723310331287699456000

[2,4,24,192,1920,23040,322560,5160960,92897280,
 1857945600,40874803200,980995276800,
 25505877196800,714164561510400,21424936845312000,
 685597979049984000,23310331287699456000]