A121964 Number of benzenoids with 21 hexagons, C_(2h) symmetry and containing 2n carbon atoms.

1, 13, 45, 188, 587, 1588, 4547, 11377, 24111, 47515, 85645, 124260, 117943

Offset: 30

Author

Parthasarathy Nambi, Sep 10 2006

Keywords

• nonn

Comments

See Table 4 column 6 of Brinkmann et al. paper.

Examples

			If n=30 then the number of benzenoids with 21 hexagons with C_(2h) symmetry is 1 which is the first term in the sequence.
		

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.