This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A058502 #9 Aug 07 2022 07:50:26
%S A058502 2,28,3592,4375990,45881030476,4761512868259324,
%T A058502 4226568802536503453176,33913358590726454284540553032,
%U A058502 2539147871121449320978174414096629904,1751590210907807486213696422942566723118774192,10257642878603441540313639499316772578643776243183698528
%N A058502 Number of cyclic subgroups of Chevalley group A_n(3) (the group of nonsingular n X n matrices over GF(3)).
%H A058502 Sean A. Irvine, <a href="https://github.com/archmageirvine/joeis/blob/master/src/irvine/oeis/a058/A058502.java">Java program</a> (github)
%F A058502 a(n) = Sum_{d} |{g element of A_n(3): order(g)=d}| / phi(d), where phi is the Euler totient function. - _Sean A. Irvine_, Aug 07 2022
%Y A058502 Cf. A053658 (unlabeled case), A062250, A062552, A053290.
%K A058502 nonn
%O A058502 1,1
%A A058502 Ahmed Fares (ahmedfares(AT)my-deja.com), Jul 02 2001
%E A058502 More terms from _Vladeta Jovovic_, Jul 05 2001
%E A058502 a(6)-a(7) corrected and more terms from _Sean A. Irvine_, Aug 07 2022