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 A378281 #11 Nov 27 2024 12:33:13 %S A378281 0,0,0,0,1,12,84,560,3276,79632,1105104,16571808,176344740 %N A378281 Number of subgroups of S_n isomorphic to S_5, where S_n is the n-th symmetric group. %o A378281 (GAP) A378281 := function(n) %o A378281 local S; %o A378281 S := SymmetricGroup(n); %o A378281 return Sum(IsomorphicSubgroups(S, SymmetricGroup(5)), x->Index(S, Normalizer(S, Image(x)))); %o A378281 end; %Y A378281 Column k=5 of A378163. %Y A378281 Cf. A000085, A378279, A378280. %K A378281 nonn,hard,more %O A378281 1,6 %A A378281 _Jianing Song_, Nov 21 2024