A057008 - OEIS

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A057008

Number of conjugacy classes of subgroups of index n in free group of rank 5.

1, 31, 1361, 334576, 207009649, 268530771271, 644969015852641, 2642258726261312896, 17337468317813249073281, 173383832437017181584973783, 2538593496477071922439308897841 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	REFERENCES	`J. H. Kwak and J. Lee, J. Graph Th., 23 (1996), 105-109.` `V. A. Liskovets, Reductive enumeration under mutually orthogonal group actions, Acta Applic. Math., 52 (1998), 91-120.` `R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see Problem 5.13(c), pp. 76, 112.`
	LINKS	`J. H. Kwak and J. Lee, Enumeration of graph coverings and surface branched coverings, Lecture Note Series 1 (2001), Com^2MaC-KOSEF, Korea. See chapter 3.`
	CROSSREFS	`Cf. A057004-A057013.` `Sequence in context: A078961 A049292 A069406 * A159487 A130661 A187701` `Adjacent sequences: A057005 A057006 A057007 * A057009 A057010 A057011`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Sep 09 2000`
	EXTENSIONS	`More terms from Francisco Salinas (franciscodesalinas(AT)hotmail.com), Dec 25 2001`

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Last modified February 17 09:41 EST 2012. Contains 206009 sequences.