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 A316536 #5 Jul 06 2018 23:13:10 %S A316536 1,5,13,42,49,105,116,498,254,381,378,1402,550,929,1383,3110,1041, %T A316536 2530,1486,5386,3512,2952,2120,24770 %N A316536 Number of abelian subgroups of the group SL(2, Z(n)), counting conjugates as distinct. %o A316536 (GAP) Concatenation([1], List([2..10], n->Sum( Filtered( ConjugacyClassesSubgroups( SL(2, Integers mod n)), x->IsAbelian( Representative(x))), Size))); %Y A316536 Cf. A316537, A316559. %K A316536 nonn,more %O A316536 1,2 %A A316536 _Andrew Howroyd_, Jul 06 2018