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A051189 as a simple table

na(n)
01
18
2128
33072
498304
53932160
6188743680
710569646080
8676457349120
948704929136640
103896394330931200
11342882701121945600
1232916739307706777600
133423340888001504870400
14383414179456168545484800

[1,8,128,3072,98304,3932160,188743680,10569646080,
 676457349120,48704929136640,3896394330931200,
 342882701121945600,32916739307706777600,
 3423340888001504870400,383414179456168545484800]