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A121212
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Number of free hexagonal polygons of symmetry class C_(3h) and area n.
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1
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0, 0, 0, 0, 0, 1, 1, 0, 5, 5, 0, 21, 26, 0, 95, 118, 0, 423, 543, 0, 1923, 2507, 0, 8869, 11676, 0, 41410, 54893, 0, 195353, 260220, 0, 929423, 1242820, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,9
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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_(3h) column.
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EXAMPLE
| If n=10 then the number of free hexagonal polygons of symmetry class C_(3h) is 5 which is the tenth term in the sequence.
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CROSSREFS
| Sequence in context: A200516 A144184 A119380 * A182787 A133337 A022697
Adjacent sequences: A121209 A121210 A121211 * A121213 A121214 A121215
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KEYWORD
| nonn
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AUTHOR
| Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Aug 19 2006
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