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%I #3 Mar 30 2012 16:50:30
%S 0,1,4,17,56,187,586,1827,5562,16811,50225,149135,439818,1290975,
%T 3772259,10983684,31878940,92278466,266481212,767972142,2209210615,
%U 6345086203
%N Number of fused bicyclic skeletons with n carbon atoms (see Parks et al. for precise definition).
%D Camden A. Parks and James B. Hendrickson, Enumeration of monocyclic and bicyclic carbon skeletons, J. Chem. Inf. Comput. Sci., vol. 31, 334-339 (1991).
%K nonn
%O 4,3
%A _N. J. A. Sloane_, Aug 27 2006