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 A316559 #5 Jul 06 2018 23:13:29 %S A316559 1,5,34,147,251,309,890,10683,2440,2487,3088 %N A316559 Number of abelian subgroups of the group GL(2, Z(n)), counting conjugates as distinct. %o A316559 (GAP) Concatenation([1], List([2..7], n->Sum( Filtered( ConjugacyClassesSubgroups( GL(2, Integers mod n)), x->IsAbelian( Representative(x))), Size))); %Y A316559 Cf. A316536, A316560. %K A316559 nonn,more %O A316559 1,2 %A A316559 _Andrew Howroyd_, Jul 06 2018