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 A052826 #14 Apr 18 2017 07:04:09
%S A052826 0,0,2,9,48,315,2497,23394,254132,3149826,43945354,682314028,
%T A052826 11676044036,218402171520,4433885571840,97098961376112,
%U A052826 2281563329170752,57255174735315792,1528204674443305680,43227315891291907488,1291646719998952196448,40652195494651491747840
%N A052826 A simple grammar: product of cycles and cycles of cycles.
%H A052826 INRIA Algorithms Project, <a href="http://ecs.inria.fr/services/structure?nbr=791">Encyclopedia of Combinatorial Structures 791</a>
%F A052826 E.g.f.: log(-1/(-1+x))*log(-1/(-1+log(-1/(-1+x)))).
%p A052826 spec := [S,{B=Cycle(C),C=Cycle(Z),S=Prod(C,B)},labeled]: seq(combstruct[count](spec,size=n), n=0..20);
%K A052826 easy,nonn
%O A052826 0,3
%A A052826 encyclopedia(AT)pommard.inria.fr, Jan 25 2000
%E A052826 More terms from _Alois P. Heinz_, Mar 16 2016