A123142 - OEIS

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A123142

Number of benzenoids with 23 hexagons, C_(2v) symmetry and containing n carbon atoms.

2, 9, 33, 38, 235, 124, 704, 435, 2283, 1437, 6954, 3628, 17864, 9528, 43798, 24237, 106293, 53593, 228216, 104754, 431864, 188701, 760883, 300925, 1212591, 373411, 1536669, 305586, 1298746, 129710, 586556

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OFFSET

64,1

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) 842-851. See Table 6 column 7 on page 847.

LINKS

Table of n, a(n) for n=64..94.

EXAMPLE

If n=64 then the number of benzenoids with 23 hexagons with C_(2v) symmetry is 2.

If n=65 then the number of benzenoids with 23 hexagons with C_(2v) symmetry is 9.

If n=66 then the number of benzenoids with 23 hexagons with C_(2v) symmetry is 33.

If n=67 then the number of benzenoids with 23 hexagons with C_(2v) symmetry is 38.

If n=94 then the number of benzenoids with 23 hexagons with C_(2v) symmetry is 586556.

CROSSREFS

Cf. A122539, A121964, A122736, A123044, A123106, A123105, A123104.

Sequence in context: A056916 A139628 A170872 * A122097 A073400 A048498

Adjacent sequences: A123139 A123140 A123141 * A123143 A123144 A123145

KEYWORD

nonn

AUTHOR

Parthasarathy Nambi, Oct 01 2006

STATUS

approved