%I A052826
%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
%N A052826 A simple grammar: product of cycles and cycles of cycles.
%H A052826 INRIA Algorithms Project, <a href="http://algo.inria.fr/bin/encyclopedia?Search=ECSnb&argsearch=791">
               Encyclopedia of Combinatorial Structures 791</a>
%F A052826 E.g.f.: ln(-1/(-1+x))*ln(-1/(-1+ln(-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);
%Y A052826 Sequence in context: A118341 A100427 A074143 this_sequence A115599 A000167 
               A109323
%Y A052826 Adjacent sequences: A052823 A052824 A052825 this_sequence A052827 A052828 
               A052829
%K A052826 easy,nonn
%O A052826 0,3
%A A052826 encyclopedia(AT)pommard.inria.fr, Jan 25 2000