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A119708 Number of free hexagonal polygons of symmetry class D_(3h) and area n. 0

%I

%S 0,0,1,1,0,1,1,0,1,4,0,3,4,0,3,12,0,6,19,0,10,41,0,16,72,0,28,149,0,

%T 50,72,0,87,557,0

%N Number of free hexagonal polygons of symmetry class D_(3h) and area n.

%D Markus Voege, Anthony J. Guttmann and Iwan Jensen, "On the number of benzenoid hydrocarbons", J. Chem. Inf. Comput. Sci., (2002), vol. 42, 456-466.

%Y Cf. A121212, A121211, A121210, A120991.

%K nonn

%O 1,10

%A _N. J. A. Sloane_, Aug 27 2006

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Last modified December 14 14:28 EST 2018. Contains 318097 sequences. (Running on oeis4.)