%I A052858
%S A052858 0,0,2,3,16,65,456,3157,28624,276705,3136240,38531141,528468744,
%T A052858 7837577761,126588882616,2194957583925,40854219413536,
%U A052858 810192673705793,17082845929433952,381225135102420997
%N A052858 A simple grammar.
%H A052858 INRIA Algorithms Project, <a href="http://algo.inria.fr/bin/encyclopedia?Search=ECSnb&argsearch=826">
               Encyclopedia of Combinatorial Structures 826</a>
%F A052858 E.g.f.: ln(-1/(-1+x*exp(x)-x))
%p A052858 spec := [S,{B=Set(Z,1 <= card),C=Prod(Z,B),S=Cycle(C)},labeled]: seq(combstruct[count](spec, 
               size=n), n=0..20);
%Y A052858 Sequence in context: A012705 A103331 A052506 this_sequence A073997 A007118 
               A012572
%Y A052858 Adjacent sequences: A052855 A052856 A052857 this_sequence A052859 A052860 
               A052861
%K A052858 easy,nonn
%O A052858 0,3
%A A052858 encyclopedia(AT)pommard.inria.fr, Jan 25 2000