A122539 Number of benzenoids with 21 hexagons with D_(2h) symmetry and 60+2n carbons.

1, 3, 5, 8, 12, 16, 16, 42, 31, 43, 45, 73, 30, 40

Offset: 0

Author

Parthasarathy Nambi, Sep 18 2006

Keywords

• nonn
• fini
• full

Comments

The total number of carbons in 21 free hexagons is 6*21=126, but since they have to be attached (form overlapping molecules sharing edges) the sequence ends already at compounds with 86 carbons. - R. J. Mathar, May 02 2008

Examples

			For n=10, there are 16 different forms of C_70H_30 of benzenoids of 21 hexagons attached along at least one edge, which each have D_(2h) planar symmetry.
		

Links

• 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 5 on page 846.

Extensions

Edited by R. J. Mathar, May 02 2008

Follow-up edits by Andrey Zabolotskiy, Nov 10 2023