A176709 - OEIS

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A176709

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

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 * A336800 A083816 A233092` `Adjacent sequences: A176706 A176707 A176708 * A176710 A176711 A176712`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane, Dec 07 2010`
	STATUS	`approved`

Last modified March 9 02:20 EST 2021. Contains 341961 sequences. (Running on oeis4.)