A123140 Number of benzenoids with 23 hexagons, D_(2h) symmetry and containing 2n carbon atoms.

1, 3, 3, 6, 13, 19, 24, 35, 45, 79, 70, 108, 70, 169, 0, 103

Offset

32,2

Links

Table of n, a(n) for n=32..47.

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) 842-851. See Table 6 column 5 on page 847.

Formula

Sum_n a(n) = 748 = A121211(23). - Andrey Zabolotskiy, Nov 09 2023

Example

If 2n=64 then the number of benzenoids with 23 hexagons with D_(2h) symmetry is 1.
If 2n=94 then the number of benzenoids with 23 hexagons with D_(2h) symmetry is 103.

Crossrefs

Cf. A121211, A122539, A121964, A122736, A123044, A123106, A123105, A123104.

Sequence in context: A168073 A231829 A287151 * A123289 A096572 A318540

Adjacent sequences: A123137 A123138 A123139 * A123141 A123142 A123143

Keyword

nonn,fini,full

Author

Parthasarathy Nambi, Oct 01 2006

Extensions

Name and offset corrected and a(46) = 0 inserted by Andrey Zabolotskiy, Nov 09 2023

Status

approved