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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A129012 Isomer numbers for the constant-isomer series: the Kekulean even carbon series (ordinary and TRS benzenoid hydrocarbons).

Original entry on oeis.org

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

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Author

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

Keywords

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

Cf. A129013-A129021.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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