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A323923
Branched catafusenes (cata-condensed benzenoids) without helicenes, symmetry C_s.
7
0, 1, 7, 44, 206, 937, 3997, 16719, 68520, 278239, 1121632, 4504875
OFFSET
4,3
LINKS
A. T. Balaban, J. Brunvoll, B. N. Cyvin, and S. J. Cyvin, Enumeration of branched catacondensed benzenoid hydrocarbons and their numbers of Kekulé structures, Tetrahedron 44(1) (1988), 221-228. See Table 2.
Björg N. Cyvin, Jon Brunvoll and Sven J. Cyvin, Enumeration of benzenoid systems and other polyhexes, p. 65-180 in: I. Gutman (ed.), Advances in the Theory of Benzenoid Hydrocarbons II, Springer, 1992.
CROSSREFS
For any symmetry, see A323851.
Sequence in context: A165210 A162454 A203210 * A026116 A216237 A291388
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Feb 09 2019
EXTENSIONS
Name clarified, a(13)-a(15) from Cyvin, Brunvoll & Cyvin (Table 17) added by Andrey Zabolotskiy, Feb 16 2023
STATUS
approved