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 A074654 #6 Mar 30 2012 17:37:12
%S A074654 1,472,467133,636541920,1038934571875,1903991899195896,
%T A074654 3782689379194538057,7975744222034262960000,
%U A074654 17602442780233361771120400,40278979798251016073962405000
%N A074654 Number of Lyndon words (aperiodic necklaces) with 5n beads of 5 colors, n beads of each color. One color labeled, the other 4 unlabeled.
%H A074654 <a href="/index/Lu#Lyndon">Index entries for sequences related to Lyndon words</a>
%F A074654 1/(120n) * sum over d|n of {mu(n/d) * (5d)! / d!^5}.
%Y A074654 Inverse Witt transform of A006180.
%K A074654 nonn
%O A074654 1,2
%A A074654 _Christian G. Bower_, Aug 29 2002