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%I #4 Mar 30 2012 17:25:49
%S 1,13,45,188,587,1588,4547,11377,24111,47515,85645,124260,117943
%N Number of benzenoids with 21 hexagons, C_(2h) symmetry and containing 2n carbon atoms.
%C See Table 4 column 6 of Brinkmann et al. paper.
%D G. Brinkmann, G. Caporossi and P. Hansen, "A survey and new results on computer enumeration of polyhex and fusene hydrocarbons", J. Chem. Inf. Comput. Sci., vol. 43 (2003), pp. 842-851.
%e If n=30 then the number of benzenoids with 21 hexagons with C_(2h) symmetry is 1 which is the first term in the sequence.
%K nonn
%O 30,2
%A _Parthasarathy Nambi_, Sep 10 2006
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