A067768 Number of alternating link diagrams with n crossings, 3 connected components and two external legs.

22, 728, 14884, 244908, 3575045, 48517524, 628013796, 7871666088, 96451145091, 1162484964230, 13840075278704, 163246693686684, 1911737961254907, 22262254374655710

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