A120448 Number of isomers of polyhex hydrocarbons with C_(2v) symmetry with nineteen hexagons.

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

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. 610-619.

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: A087964 A372798 A174182 * A095422 A195999 A059189

Adjacent sequences: A120445 A120446 A120447 * A120449 A120450 A120451

Keyword

nonn

Author

Parthasarathy Nambi, Aug 27 2006

Status

approved