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A323931
Unbranched catafusenes, mirror-symmetrical.
3
0, 0, 1, 1, 4, 3, 12, 10, 34, 28, 97, 81, 271, 226, 764, 638, 2141, 1787, 6025, 5030, 16924, 14116, 47623, 39727, 133934, 111655, 377003, 314297, 1061064, 884199
OFFSET
1,5
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 1.
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
The main sequences listed in Table 1 of Balaban et al. (1988) are A323931, A323932, A003104, A323851, A038142.
Sequence in context: A166552 A122804 A122544 * A205371 A270633 A272220
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Feb 09 2019
EXTENSIONS
a(13)-a(30) from Cyvin, Brunvoll & Cyvin (Tables 14 & 15) added by Andrey Zabolotskiy, Feb 16 2023
STATUS
approved