A120991 Number of free hexagonal polygons of symmetry class C_(2v) and area n.

0, 0, 1, 1, 9, 12, 39, 61, 178, 274, 796, 1251, 3578, 5692, 16290, 26069, 74980, 120676, 348564, 563503, 1635175, 2652445, 7729807, 12574028, 36784467, 59975232, 176063801, 287613473, 846967739, 1385815492, 4092516853, 6705360813, 19852731854, 32565589836, 96642900684

Offset: 1

Author

Parthasarathy Nambi, Aug 19 2006

Keywords

• nonn

Links

• Markus Vöge, Anthony J. Guttmann and Iwan Jensen, On the number of benzenoid hydrocarbons, J. Chem. Inf. Comput. Sci., (2002), vol. 42, 456-466. See Table 3 under the column C_(2c) [sic. This is a typo, should be C_(2v) instead].

Extensions

More terms from N. J. A. Sloane, Aug 27 2006

Name corrected by Andrey Zabolotskiy, Nov 10 2023