A121983 - OEIS

A121983

Number of benzenoids with 21 hexagons with C_(2v) symmetry containing n carbon atoms.

1, 7, 12, 70, 36, 235, 167, 867, 517, 2453, 1262, 6150, 3642, 16214, 8863, 37733, 18149, 75274, 34783, 138929, 60330, 239646, 82662, 335306, 74046, 311055, 33940, 152826, 1635175

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OFFSET

59,2

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), pp. 842-851. See Table 4 column 7 on page 846.

LINKS

Table of n, a(n) for n=59..87.

EXAMPLE

If n=59 then the number of benzenoids with 21 hexagons with C_(2v) symmetry is 1 which is the first term in the sequence.

If n=70 then the number of benzenoids with 21 hexagons with C_(2v) symmetry is 6150.

CROSSREFS

Sequence in context: A372734 A358782 A119179 * A177169 A275005 A298678

Adjacent sequences: A121980 A121981 A121982 * A121984 A121985 A121986

KEYWORD

nonn

AUTHOR

Parthasarathy Nambi, Sep 09 2006

STATUS

approved