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A067644 Number of prime alternating tangles (or knots) of type Gamma_1 with two connected components. 2
1, 0, 2, 2, 6, 30, 62, 382, 1338, 6216, 29656, 131316, 669138, 3156172, 16032652, 80104192, 408448012, 2105616701 (list; graph; refs; listen; history; text; internal format)
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

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Last modified June 20 00:47 EDT 2019. Contains 324223 sequences. (Running on oeis4.)