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A129022 Isomer numbers for the fluorenoid/fluoranthenoid constant-isomer series. 1
1, 1, 1, 2, 3, 2, 7, 7, 9, 17, 9, 31, 31, 41, 72, 41, 120, 120 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

This allows a single pentagonal ring among otherwise hexagonal rings.

The terms occur in groups of 5: X, 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, 10-15 (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.]

LINKS

Table of n, a(n) for n=0..17.

CROSSREFS

Cf. A129012-A129021, A129023.

Sequence in context: A260724 A256581 A122697 * A210564 A208930 A122076

Adjacent sequences:  A129019 A129020 A129021 * A129023 A129024 A129025

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, May 10 2007

STATUS

approved

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Last modified September 17 10:37 EDT 2019. Contains 327129 sequences. (Running on oeis4.)