login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A089891 Number of knots and links with unknotting (unlinking) number U=1. 3
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 * 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 14 10:19 EST 2019. Contains 329111 sequences. (Running on oeis4.)