A160446 - OEIS

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A160446

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

1, 16, 251, 14491, 1730861 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	REFERENCES	`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=1..5.`
	CROSSREFS	`Sequence in context: A222383 A110394 A220459 * A158531 A171321 A077412` `Adjacent sequences: A160443 A160444 A160445 * A160447 A160448 A160449`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane, Nov 12 2009`
	STATUS	`approved`

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Last modified May 23 16:03 EDT 2013. Contains 225610 sequences.