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Search: id:A120386
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| A120386 |
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Number of isomers of polyhex hydrocarbons with C_(2h) symmetry with nineteen hexagons. |
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+0
1
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| 0, 3, 17, 66, 189, 589, 1677, 3829, 7948, 15649, 25543, 26931, 15472
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OFFSET
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54,2
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COMMENT
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See Table 4 column 3 on page 615 of the paper by Caporossi and Hansen. Also the sequence starts for the hydrocarbon C_54H_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 56 then the number of isomers of polyhex hydrocarbons with C_(2h) symmetry with nineteen hexagons is 3 which is the third term in the sequence.
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CROSSREFS
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Cf. A018190.
Adjacent sequences: A120383 A120384 A120385 this_sequence A120387 A120388 A120389
Sequence in context: A093418 A033562 A130857 this_sequence A061982 A101562 A034566
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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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