A123105 Number of benzenoids with 22 hexagons, C_(2h) symmetry and containing 2n carbon atoms.

2, 32, 138, 510, 1627, 4641, 12646, 31360, 70888, 144276, 261789, 409747, 524600, 462848, 232842

Offset

31,1

Links

Table of n, a(n) for n=31..45.

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 5 column 6 on page 847.

Formula

Sum_n a(n) = 2157946 = A121210(22). - Andrey Zabolotskiy, Nov 15 2023

Crossrefs

Cf. A122539, A121964, A122736, A123044, A121210.

Sequence in context: A191997 A274654 A112850 * A123287 A236550 A012642

Adjacent sequences: A123102 A123103 A123104 * A123106 A123107 A123108

Keyword

nonn,fini,full

Author

Parthasarathy Nambi, Sep 28 2006

Extensions

Name and offset edited by Andrey Zabolotskiy, Nov 15 2023

Status

approved