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A129023 Isomer numbers for the indacenoid constant-isomer series. +0
2
1, 1, 1, 3, 6, 7, 6, 12, 28, 26, 28, 51 (list; graph; listen)
OFFSET

0,4

COMMENT

This allows two single pentagonal rings among otherwise hexagonal rings.

The terms occur in groups of 4: X, Y, X, Y, ...

REFERENCES

J. Brunvoll, B. N. Cyvin, S. J. Cyvin, G. Brinkmann and J. Bornhoft, Z. Naturforsch., 51a, 1073 (1996).

S. J. Cyvin, B. N. Cyvin and J. Brunvoll, J. Molec. Struct. (Theochem), 281, 229 (1993).

J. R. Dias, Chem. Phys. Lett., 185, 10 (1991).

J. R. Dias, J. Chem. Inf. Comput. Sci., 32, 203-209 (1992). (*)

J. R. Dias, J. Chem. Inf. Comput. Sci. 33, 117 (1993).

J. R. Dias, Discr. App. Math., 67, 79 (1996).

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. [See Section 5.2.]

CROSSREFS

Cf. A129012-A129022.

Sequence in context: A016616 A021276 A067753 this_sequence A152083 A003458 A133339

Adjacent sequences: A129020 A129021 A129022 this_sequence A129024 A129025 A129026

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), May 10 2007

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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.


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