A008987 - OEIS

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A008987

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

1, 1, 2, 6, 21, 99, 588, 3829 (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: A008988 A061232 A020091 * A079129 A130275 A156808` `Adjacent sequences: A008984 A008985 A008986 * A008988 A008989 A008990`
	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 14 16:17 EST 2012. Contains 205635 sequences.