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A122686 List of numbers that are not the Wiener index of any tree. 1
2, 3, 5, 6, 7, 8, 11, 12, 13, 14, 15, 17, 19, 21, 22, 23, 24, 26, 27, 30, 33, 34, 37, 38, 39, 41, 43, 45, 47, 51, 53, 55, 60, 61, 69, 73, 77, 78, 83, 85, 87, 89, 91, 99, 101, 106, 113, 147, 159 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

M. Lepovic and I. Gutman, A collective property of trees and chemical trees, J. Chem. Inf. Comput. Sci., 38 (1998), 823-826.

Stephan G. Wagner, Hua Wang and Gang Yu. Molecular graphs and the inverse Wiener index problem. Discrete Applied Mathematics, 2009: 1544-1554.

LINKS

Table of n, a(n) for n=1..49.

Stephan Wagner, Graph-theoretical enumeration and digital expansions: an analytic approach, Dissertation, Fakult. f. Tech. Math. u. Tech. Physik, Tech. Univ. Graz, Austria, Feb. 2006.

Stephan Wagner, A class of trees and its Wiener index, Acta Applic. Mathem. 91 (2) (2006) 119-132.

CROSSREFS

Sequence in context: A028803 A050942 A096600 * A161873 A224517 A080220

Adjacent sequences:  A122683 A122684 A122685 * A122687 A122688 A122689

KEYWORD

nonn,fini,full

AUTHOR

N. J. A. Sloane, Sep 23 2006

STATUS

approved

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Last modified October 23 08:57 EDT 2019. Contains 328345 sequences. (Running on oeis4.)