A008989 - OEIS

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A008989

Number of immersions of unoriented circle into unoriented sphere with n double points.

1, 1, 2, 6, 19, 76, 376, 2194 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	REFERENCES	`V. I. Arnold, Topological Invariants of Plane Curves..., American Math. Soc., 1994, p. 18.`
	CROSSREFS	`Sequence in context: A150119 A181770 A138800 * A057240 A079564 A079453` `Adjacent sequences: A008986 A008987 A008988 * A008990 A008991 A008992`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`
	EXTENSIONS	`Two more terms from Guy H. Valette (guy.valette(AT)skynet.be), Feb 09 2004`

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Last modified February 15 17:42 EST 2012. Contains 205829 sequences.