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A121210 Number of free hexagonal polygons of symmetry class C_(2h) and area n. 1

%I

%S 0,0,0,1,1,7,7,35,36,169,177,807,859,3864,4145,18616,20098,90265,

%T 97913,440230,479367,2157946,2357108,10623852,11634624,52496803,

%U 57618226,260236031,286164543,1293603599,1424824820,6445885963,7109939186,32187437996,35548330099

%N Number of free hexagonal polygons of symmetry class C_(2h) 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. See Table 3 under the C_(2h) column.

%e If n=10 then the number of free hexagonal polygons of symmetry class C_(2h) is 169 which is the tenth term in the sequence.

%K nonn

%O 1,6

%A _Parthasarathy Nambi_, Aug 19 2006

%E More terms from _N. J. A. Sloane_, Aug 27 2006

%E Corrected by _R. J. Mathar_, Oct 26 2006

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Last modified January 22 15:57 EST 2019. Contains 319364 sequences. (Running on oeis4.)