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 A269890 #18 Aug 10 2023 01:56:26
%S A269890 2,8,33,193,953,7440,55200,627187,7510549
%N A269890 Number of conjugacy classes of subgroups of the hyperoctahedral group.
%o A269890 (GAP) Length(ConjugacyClassesSubgroups(CoxeterGroup( "B", n )));
%o A269890 (Magma) [#Subgroups(CoxeterGroup("B" cat IntegerToString(n))) : n in [1..9]]; // _Robin Visser_, Aug 09 2023
%Y A269890 Cf. A000638.
%K A269890 nonn,hard,more
%O A269890 1,1
%A A269890 _Martin Rubey_, Mar 07 2016
%E A269890 a(6)-a(9) from _Robin Visser_, Aug 09 2023