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A089891
Number of knots and links with unknotting (unlinking) number U=1.
3
1, 1, 1, 2, 3, 5, 12, 21
OFFSET
2,4
REFERENCES
A. Kawauchi, A Survey of Knot Theory, Birkhäuser, Basel, Boston, Berlin, 1996.
LINKS
Slavik Jablan, Ordering Knots.
Slavik Jablan and Radmila Sazdanovic, LinKnot.
P. Kohn, Unlinking two component links, Osaka J. Math. 30(4), 741-752 (1993).
CROSSREFS
Cf. A078477.
Sequence in context: A193776 A051915 A064688 * A282237 A004689 A183364
KEYWORD
nonn,more
AUTHOR
Slavik Jablan and Radmila Sazdanovic, Jan 10 2004
STATUS
approved