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A122671 Number of catacondensed coronoid systems with n hexagons with a single hole. 0
1, 3, 15, 62, 312, 1435, 6785 (list; graph; refs; listen; history; text; internal format)
OFFSET
8,2
LINKS
Table of n, a(n) for n=8..14.
S. J. Cyvin et al., The simplest coronoids: hollow hexagons, Struct. Chem., 2 (1991), 555-566.
CROSSREFS
Cf. A038140.
Sequence in context: A218227 A072336 A356421 * A317181 A067562 A062211
Adjacent sequences: A122668 A122669 A122670 * A122672 A122673 A122674
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Sep 23 2006
EXTENSIONS
Name clarified by Andrey Zabolotskiy, Feb 16 2023
STATUS
approved

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Last modified May 12 20:41 EDT 2024. Contains 372494 sequences. (Running on oeis4.)