%I A003212 M3449
%S A003212 1,4,12,36,108,264,708,1668,4536,10926,28416
%N A003212 Cluster series for diamond.
%D A003212 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A003212 J. W. Essam, Percolation and cluster size, in C. Domb and M. S. Green, 
               Phase Transitions and Critical Phenomena, Ac. Press 1972, Vol. 2; 
               see especially pp. 225-226.
%D A003212 M. F. Sykes and J. W. Essam, Critical percolation probabilities by series 
               methods, Phys. Rev., 133 (1964), A310-A315.
%Y A003212 Sequence in context: A001411 A095350 A084776 this_sequence A156945 A006817 
               A003119
%Y A003212 Adjacent sequences: A003209 A003210 A003211 this_sequence A003213 A003214 
               A003215
%K A003212 nonn
%O A003212 0,2
%A A003212 N. J. A. Sloane (njas(AT)research.att.com).