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A122672
Number of primitive coronoid systems with n hexagons.
1
1, 1, 3, 2, 11, 12, 40, 68, 192, 395, 1061, 2432, 6318, 15417, 39660, 99550, 256388, 654003, 1689973, 4355457, 11305165, 29347706, 76527893
OFFSET
8,3
LINKS
S. J. Cyvin et al., The simplest coronoids: hollow hexagons, Struct. Chem., 2 (1991), 555-566.
CROSSREFS
Sequence in context: A159610 A074246 A134426 * A194608 A297870 A052973
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Sep 23 2006
EXTENSIONS
a(15)-a(30) from Johan Nilsson, Aug 12 2015
STATUS
approved