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A005546 as a simple table

na(n)
31
424
5360
64000
739330
8367912
93370604
1030630980
11277824572
122522478772
1322959239730
14209629138108
151920548559328

[1,24,360,4000,39330,367912,3370604,30630980,
 277824572,2522478772,22959239730,209629138108,
 1920548559328]