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Search: id:A120371
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| A120371 |
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Number of isomers of polyhex hydrocarbons with C_(2h) symmetry with eighteen hexagons. |
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+0
1
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| 1, 14, 59, 206, 601, 1602, 3832, 8050, 14601, 22472, 24071, 14756
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OFFSET
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52,2
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COMMENT
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See Table 3 column 3 on page 614 of the paper by Caporossi and Hansen. Also the sequence starts for the hydrocarbon C_52H_18. If the number of carbons is an odd number then the number of isomers with this symmetry is zero.
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REFERENCES
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G. Caporossi and P. Hansen, "Enumeration of Polyhex Hydrocarbons to h=21", J. Chem. Inf. Comput. Sci., vol. 38 (1998) pp. 610-619.
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EXAMPLE
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If the number of carbons is 54 then the number of isomers of polyhex hydrocarbons with C_(2h) symmetry with eighteen hexagons is 14 which is the third term in the sequence.
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CROSSREFS
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Cf. A018190.
Sequence in context: A084195 A033856 A100174 this_sequence A062022 A100171 A063492
Adjacent sequences: A120368 A120369 A120370 this_sequence A120372 A120373 A120374
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KEYWORD
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nonn
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AUTHOR
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Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Aug 27 2006
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