A323923 - OEIS

A323923

Branched catafusenes (cata-condensed benzenoids) without helicenes, symmetry C_s.

0, 1, 7, 44, 206, 937, 3997, 16719, 68520, 278239, 1121632, 4504875

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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.

KEYWORD

nonn,more

AUTHOR

EXTENSIONS

Name clarified, a(13)-a(15) from Cyvin, Brunvoll & Cyvin (Table 17) added by Andrey Zabolotskiy, Feb 16 2023

STATUS

approved