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A090831 as a simple table

na(n)
12
27
322
475
5298
61409
77900
852021
9397756
103468667
1133656220
12354326769
133970080798
1446804154165
15577838630958
167468797926219
17101264140457250
181443524097355225
1921670184170964846
20342875871451985761

[2,7,22,75,298,1409,7900,52021,397756,3468667,
 33656220,354326769,3970080798,46804154165,
 577838630958,7468797926219,101264140457250,
 1443524097355225,21670184170964846,
 342875871451985761]