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A121141
Numbers of isomers of unbranched a-4-catapolyheptagons - see Brunvoll reference for precise definition.
1
1, 5, 37, 254, 1690, 10476, 62000
OFFSET
4,2
REFERENCES
J. Brunvoll, S. J. Cyvin and B. N. Cyvin, Isomer enumeration of polygonal systems..., J. Molec. Struct. (Theochem), 364 (1996), 1-13.
CROSSREFS
Sequence in context: A054417 A080507 A108049 * A331449 A220634 A083232
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Aug 13 2006
STATUS
approved