%I A052814
%S A052814 0,1,1,2,6,16,49,156,511,1723,5942,20817,73938,265611,963225,3521667,
%T A052814 12966696,48037862,178936340,669748197,2517688316
%N A052814 A simple grammar.
%H A052814 INRIA Algorithms Project, <a href="http://algo.inria.fr/bin/encyclopedia?Search=ECSnb&argsearch=779">
               Encyclopedia of Combinatorial Structures 779</a>
%p A052814 spec := [S,{B=PowerSet(C),S=Prod(B,Z),C=Cycle(S)},unlabeled]: seq(combstruct[count](spec,
               size=n), n=0..20);
%Y A052814 Sequence in context: A132803 A079565 A052890 this_sequence A151445 A000136 
               A013989
%Y A052814 Adjacent sequences: A052811 A052812 A052813 this_sequence A052815 A052816 
               A052817
%K A052814 easy,nonn
%O A052814 0,4
%A A052814 encyclopedia(AT)pommard.inria.fr, Jan 25 2000