A108072 Number of inner dual graphs of planar polyhexes with n hexagons having no nontrivial symmetry.

1, 0, 0, 0, 0, 5, 22, 90, 342, 1247, 4491, 16095, 57906, 209170, 760830, 2784913, 10262649, 38051063, 141914613, 532131882, 2005320952, 7591794561, 28863820538, 110172051829, 422060152511, 1622369728951

Offset

1,6

Links

Table of n, a(n) for n=1..26.

Gunnar Brinkmann, Gilles Caporossi and Pierre Hansen, A constructive enumeration of fusenes and benzenoids, Journal of Algorithms, Volume 45, Issue 2, November 2002, Pages 155-166.

Gunnar Brinkmann, Gilles Caporossi and Pierre Hansen, A Survey and New Results on Computer Enumeration of Polyhex and Fusene Hydrocarbons, J. Chem. Inf. Comput. Sci. 2003, 43, 3, 842-851.

Crossrefs

Cf. A018190, A108070, A108071.

Sequence in context: A262293 A086090 A037529 * A081892 A128566 A097138

Adjacent sequences: A108069 A108070 A108071 * A108073 A108074 A108075

Keyword

nonn

Author

Gunnar Brinkmann, Jun 05 2005

Extensions

Name corrected by Andrey Zabolotskiy, Oct 01 2022

Status

approved