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A129012
Isomer numbers for the constant-isomer series: the Kekulean even carbon series (ordinary and TRS benzenoid hydrocarbons).
13
1, 1, 1, 2, 3, 3, 7, 12, 12, 27, 38, 38, 86, 128, 128, 264, 373, 373, 749, 1055, 1055, 2022, 2765, 2765
OFFSET
0,4
COMMENTS
The terms occur in groups of three, X, X, Y.
It would be nice to have generating functions for any of A129012-A129021.
REFERENCES
J. R. Dias, The Periodic Table Set as a Unifying Concept in Going from Benzenoid Hydrocarbons to Fullerene Carbons, in "The Periodic Table: Into the 21st Century", Edited by D. H. Rouvray and R. B. King, Research Studies Press Ltd, Baldock, Hertfordshire, England, 2004, 371-396.
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, based on email from Jerry R. Dias (DiasJ(AT)umkc.edu), May 08 2007
STATUS
approved