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A121210
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Number of free hexagonal polygons of symmetry class C_(2h) and area n.
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1
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0, 0, 0, 1, 1, 7, 7, 35, 36, 169, 177, 807, 859, 3864, 4145, 18616, 20098, 90265, 97913, 440230, 479367, 2157946, 2357108, 10623852, 11634624, 52496803, 57618226, 260236031, 286164543, 1293603599, 1424824820, 6445885963, 7109939186, 32187437996, 35548330099
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,6
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REFERENCES
| 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.
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EXAMPLE
| 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.
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CROSSREFS
| Sequence in context: A188274 A140252 A095343 * A154702 A112685 A201958
Adjacent sequences: A121207 A121208 A121209 * A121211 A121212 A121213
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KEYWORD
| nonn
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AUTHOR
| Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Aug 19 2006
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EXTENSIONS
| More terms from N. J. A. Sloane (njas(AT)research.att.com), Aug 27 2006
Corrected by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 26 2006
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