A120371 Number of isomers of polyhex hydrocarbons with C_(2h) symmetry with eighteen hexagons.

1, 14, 59, 206, 601, 1602, 3832, 8050, 14601, 22472, 24071, 14756

Offset: 52

Author

Parthasarathy Nambi, Aug 27 2006

Keywords

• nonn

Comments

See Table 3 column 3 on page 614 of the paper by Caporossi and Hansen. Also the sequence starts for the hydrocarbon C_52H_18. If the number of carbons is an odd number then the number of isomers with this symmetry is zero.

Examples

			If the number of carbons is 54 then the number of isomers of polyhex hydrocarbons with C_(2h) symmetry with eighteen hexagons is 14 which is the third term in the sequence.
		

References

• G. Caporossi and P. Hansen, "Enumeration of Polyhex Hydrocarbons to h=21", J. Chem. Inf. Comput. Sci., vol. 38 (1998) pp. 610-619.

Crossrefs

Cf. A018190.