A067644 Number of prime alternating tangles (or knots) of type Gamma_1 with two connected components.

1, 0, 2, 2, 6, 30, 62, 382, 1338, 6216, 29656, 131316, 669138, 3156172, 16032652, 80104192, 408448012, 2105616701

Offset

0,3

Links

Table of n, a(n) for n=0..17.

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. A067645, A067646.

Sequence in context: A058250 A179929 A278258 * A184312 A097801 A164347

Adjacent sequences: A067641 A067642 A067643 * A067645 A067646 A067647

Keyword

nonn

Author

N. J. A. Sloane, Feb 05 2002

Status

approved