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A121211
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Number of free hexagonal polygons of symmetry class D_(2h) and area n.
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1
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0, 1, 1, 2, 2, 3, 3, 6, 7, 11, 14, 21, 23, 41, 50, 80, 94, 156, 189, 310, 365, 615, 748, 1237, 1459, 2488, 3023, 5059, 5994, 10296, 12511, 21149, 25100, 43451, 52870
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OFFSET
| 1,4
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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 D_(2h) column.
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EXAMPLE
| If n=10 then the number of free hexagonal polygons of symmetry class D_(2h) is 11 which is the tenth term in the sequence.
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CROSSREFS
| Sequence in context: A116932 A116450 A054172 * A146157 A048848 A192495
Adjacent sequences: A121208 A121209 A121210 * A121212 A121213 A121214
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KEYWORD
| nonn
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AUTHOR
| Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Aug 19 2006
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