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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A067768 Number of alternating link diagrams with n crossings, 3 connected components and two external legs. 1
22, 728, 14884, 244908, 3575045, 48517524, 628013796, 7871666088, 96451145091, 1162484964230, 13840075278704, 163246693686684, 1911737961254907, 22262254374655710 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,1

LINKS

Table of n, a(n) for n=6..19.

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

A column of A062038.

Sequence in context: A262417 A027409 A159189 * A181181 A160037 A278440

Adjacent sequences:  A067765 A067766 A067767 * A067769 A067770 A067771

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 09 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 October 16 11:06 EDT 2019. Contains 328056 sequences. (Running on oeis4.)