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A011001 as a simple table

na(n)
481
4949
501225
5120825
52270725
532869685
5425827165
55202927725
561420494075
578996462475
5852179482355
59279871768995
601399358844975
616566222272575
6229078984349975
63122131734269895
64488526937079580
651867897112363100
666848956078664700
6724151581961607100

[1,49,1225,20825,270725,2869685,25827165,
 202927725,1420494075,8996462475,52179482355,
 279871768995,1399358844975,6566222272575,
 29078984349975,122131734269895,488526937079580,
 1867897112363100,6848956078664700,
 24151581961607100]