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A058801 as a simple table

na(n)
21
32
46
525
6116
7625
83757
925140
10184511
111473861
1212711339
13117598686
141160399052
1512152333659
16134487937252
171566878426731
1819154490559458

[1,2,6,25,116,625,3757,25140,184511,1473861,
 12711339,117598686,1160399052,12152333659,
 134487937252,1566878426731,19154490559458]