A027842 - OEIS

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A027842

Number of subgroups of index n in fundamental group of a certain fiber space.

1, 7, 34, 227, 1296, 10576 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	REFERENCES	`V. A. Liskovets and A. Mednykh, Enumeration of subgroups in the fundamental groups of orientable circle bundles over surfaces, Commun. in Algebra, 28, No. 4 (2000), 1717-1738.`
	CROSSREFS	`Cf. A027838, A027839, A027840.` `Sequence in context: A027233 A117650 A144038 * A027683 A196968 A000829` `Adjacent sequences: A027839 A027840 A027841 * A027843 A027844 A027845`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 15 15:20 EST 2012. Contains 205823 sequences.