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A121964
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Number of benzenoids with 21 hexagons, C_(2h) symmetry and containing 2n carbon atoms.
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31
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1, 13, 45, 188, 587, 1588, 4547, 11377, 24111, 47515, 85645, 124260, 117943
(list; graph; refs; listen; history; internal format)
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OFFSET
| 30,2
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COMMENTS
| See Table 4 column 6 of Brinkmann et al. paper.
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REFERENCES
| G. Brinkmann, G. Caporossi and P. Hansen, "A survey and new results on computer enumeration of polyhex and fusene hydrocarbons", J. Chem. Inf. Comput. Sci., vol. 43 (2003), pp. 842-851.
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EXAMPLE
| If n=30 then the number of benzenoids with 21 hexagons with C_(2h) symmetry is 1 which is the first term in the sequence.
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CROSSREFS
| Sequence in context: A098385 A048364 A141549 * A147208 A010003 A007587
Adjacent sequences: A121961 A121962 A121963 * A121965 A121966 A121967
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KEYWORD
| nonn
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AUTHOR
| Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Sep 10 2006
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