A160450 - OEIS

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A160450

Number of isomorphism classes of multiple coverings of graphs with specified Betti number. See reference for precise definition.

1, 5, 43, 681, 14491, 336465, 7997683, 191374041 (list; graph; refs; listen; history; 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.`
	CROSSREFS	`Sequence in context: A162695 A161635 A005989 * A114604 A085098 A099794` `Adjacent sequences: A160447 A160448 A160449 * A160451 A160452 A160453`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Nov 15 2009`

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Last modified February 15 04:23 EST 2012. Contains 205694 sequences.