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 A074656 #10 Oct 21 2021 10:48:36
%S A074656 1,6,312,30798,3941280,586637250,96197630040,16875655269942,
%T A074656 3111284137104000,595909785174026400,117634021776545937000,
%U A074656 23797087019979071174574,4912693780461256332795168,1031629572413246016139181538,219809927417367517614451764984
%N A074656 Number of Lyndon words (aperiodic necklaces) with 4n beads of 4 colors, n beads of each color.
%H A074656 <a href="/index/Lu#Lyndon">Index entries for sequences related to Lyndon words</a>
%F A074656 1/(4n) * sum over d|n of {mu(n/d) * (4d)! / d!^4}.
%e A074656 For n=1 the 6 words are 0123 0132 0213 0231 0312 0321 . - _R. J. Mathar_, Oct 21 2021
%Y A074656 a(n)=A029809(n)*6. a(n) = A074652(n)/4.
%K A074656 nonn
%O A074656 0,2
%A A074656 _Christian G. Bower_, Aug 29 2002
%E A074656 a(0)=1 prepended by _Alois P. Heinz_, Aug 24 2015