A089891 - OEIS

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A089891

Number of knots and links with unknotting (unlinking) number U=1.

1, 1, 1, 2, 3, 5, 12, 21 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`2,4`
	REFERENCES	`Kawauchi, A. (1996) A Survey of Knot Theory, Birkhauser, Basel, Boston, Berlin.` `Kohn, P. (1993) Unlinking two component links, Osaka J. Math. 30, 741-752.`
	LINKS	`Table of n, a(n) for n=2..9.` `Jablan S., Ordering Knots.` `Jablan S., Sazdanovic R., LinKnot.`
	CROSSREFS	`Cf. A078477.` `Sequence in context: A193776 A051915 A064688 * A004689 A183364 A124370` `Adjacent sequences: A089888 A089889 A089890 * A089892 A089893 A089894`
	KEYWORD	`nonn`
	AUTHOR	`Slavik Jablan and Radmila Sazdanovic (jablans(AT)yahoo.com), Jan 10 2004`
	STATUS	`approved`

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Last modified June 18 02:14 EDT 2013. Contains 226327 sequences.