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A006427 as a simple table

na(n)
120
21071
326320
4431739
55494896
658677420
7550712668
84681144391
936786186216
10271221867098
111896796135920
1212688048319278
1381709791432384
14509222462694582
153083998029716868
1618213177504318335
17105186858991413976
18595499805083872458
193311524095424508480

[20,1071,26320,431739,5494896,58677420,550712668,
 4681144391,36786186216,271221867098,1896796135920,
 12688048319278,81709791432384,509222462694582,
 3083998029716868,18213177504318335,
 105186858991413976,595499805083872458,
 3311524095424508480]