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A176709 Number of isomorphism classes of multiple coverings of graphs with specified Betti number. See references for precise definition. 0
1, 11, 901, 524137, 373486525, 268749463729, 193492277719861, 139314094050615817 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

M. W. Hero and J. F. Willenbring, Stable Hilbert series as related to the measurement of quantum entanglement, Discrete Math., 309 (2010), 6508-6514.

J. H. Kwak and J. Lee, Enumeration of graph coverings, surface branched coverings and related group theory, in Combinatorial and Computational Mathematics (Pohang, 2000), ed. S. Hong et al., World Scientific, Singapore 2001, pp. 97-161.

LINKS

Table of n, a(n) for n=0..7.

CROSSREFS

Sequence in context: A162448 A024150 A052071 * A083816 A233092 A243818

Adjacent sequences:  A176706 A176707 A176708 * A176710 A176711 A176712

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 07 2010

STATUS

approved

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Last modified May 25 21:22 EDT 2017. Contains 287059 sequences.