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A129012

Isomer numbers for the constant-isomer series: the Kekulean even carbon series (ordinary and TRS benzenoid hydrocarbons).

1, 1, 1, 2, 3, 3, 7, 12, 12, 27, 38, 38, 86, 128, 128, 264, 373, 373, 749, 1055, 1055, 2022, 2765, 2765

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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.

LINKS

Table of n, a(n) for n=0..23.

CROSSREFS

Cf. A129013-A129021.

Sequence in context: A370361 A156763 A169653 * A136122 A121875 A036251

Adjacent sequences: A129009 A129010 A129011 * A129013 A129014 A129015

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, based on email from Jerry R. Dias (DiasJ(AT)umkc.edu), May 08 2007

STATUS

approved