A129023 Isomer numbers for the indacenoid constant-isomer series.

1, 1, 1, 3, 6, 7, 6, 12, 28, 26, 28, 51

Offset

0,4

Comments

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.]

Links

Table of n, a(n) for n=0..11.

Crossrefs

Cf. A129012-A129022.

Sequence in context: A329516 A290943 A067753 * A188883 A336086 A152083

Adjacent sequences: A129020 A129021 A129022 * A129024 A129025 A129026

Keyword

nonn

Author

N. J. A. Sloane, May 10 2007

Status

approved