

A120448


Number of isomers of polyhex hydrocarbons with C_(2v) symmetry with nineteen hexagons.


0



0, 3, 17, 14, 92, 60, 316, 175, 814, 495, 2323, 1402, 6037, 3113, 12851, 6200, 24710, 11851, 46152, 18123, 72151, 18007, 74547, 8970, 40141
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OFFSET

54,2


COMMENTS

See Table 4 column 9 on page 615 of the paper by Caporossi and Hansen. Also the sequence starts for the hydrocarbon C_(54)H_(18).


REFERENCES

G. Caporossi and P. Hansen, "Enumeration of Polyhex Hydrocarbons to h=21", J. Chem. Inf. Comput. Sci., vol. 38 (1998) pp. 610619.


LINKS

Table of n, a(n) for n=54..78.


EXAMPLE

If the number of carbons is 56 then the number of isomers of polyhex hydrocarbons with C_(2v) symmetry with nineteen hexagons is 17 which is the third term in the sequence.


CROSSREFS

Cf. A018190.
Sequence in context: A273710 A087964 A174182 * A095422 A195999 A059189
Adjacent sequences: A120445 A120446 A120447 * A120449 A120450 A120451


KEYWORD

nonn


AUTHOR

Parthasarathy Nambi, Aug 27 2006


STATUS

approved



