A089891 Number of knots and links with unknotting (unlinking) number U=1.

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

Table of n, a(n) for n=2..9.

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

Adjacent sequences: A089888 A089889 A089890 * A089892 A089893 A089894

Keyword

nonn,more

Author

Slavik Jablan and Radmila Sazdanovic, Jan 10 2004

Status

approved