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A003287 as a simple table

na(n)
11
24
322
4140
5970
67196
756092
8452064
93735700
1031484244
11269613896
122339571468
1320529434520
14181871459580
151624587752400
1614617165101216

[1,4,22,140,970,7196,56092,452064,3735700,
 31484244,269613896,2339571468,20529434520,
 181871459580,1624587752400,14617165101216]