A008986 - OEIS

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A008986

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

1, 1, 3, 9, 37, 182, 1143, 7553 (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: A119856 A077365 A006229 * A105215 A158053 A009179` `Adjacent sequences: A008983 A008984 A008985 * A008987 A008988 A008989`
	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 16 06:05 EST 2012. Contains 205860 sequences.