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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A067645 Number of prime alternating tangles (or knots) of type Gamma_2 with two connected components. 2
0, 1, 1, 3, 9, 21, 101, 346, 1576, 7040, 31556, 153916, 724758, 3610768, 17853814, 90220450, 460221672, 2365627740, 12300901598 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..18.

J. L. Jacobsen and P. Zinn-Justin, A Transfer Matrix approach to the Enumeration of Knots

J. L. Jacobsen and P. Zinn-Justin, A Transfer Matrix approach to the Enumeration of Colored Links, J. Knot Theory, 10 (2001), 1233-1267.

CROSSREFS

Cf. A067644, A067646.

Sequence in context: A146909 A146248 A074000 * A101474 A298836 A252284

Adjacent sequences:  A067642 A067643 A067644 * A067646 A067647 A067648

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 05 2002

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 June 20 19:36 EDT 2019. Contains 324234 sequences. (Running on oeis4.)