%I
%S 1,2,4,8,24,72,264,1074,4490,20296,92768,439148,2118654,10377708,
%T 51740280,260545092,1328891356,6836872181
%N Number of prime alternating tangles (or knots) with two connected components.
%H S. R. Finch, <a href="http://www.people.fas.harvard.edu/~sfinch/">Knots, links and tangles</a>
%H S. R. Finch, <a href="/A002863/a002863_4.pdf">Knots, links and tangles</a>, Aug 08 2003. [Cached copy, with permission of the author]
%H J. L. Jacobsen and P. ZinnJustin, <a href="http://arXiv.org/abs/mathph/0102015">A Transfer Matrix approach to the Enumeration of Knots</a>
%Y Equals A067644 + 2*A067645.
%K nonn
%O 0,2
%A _N. J. A. Sloane_, Feb 05 2002
%E More terms from AntonioG. Astudillo (afg_astudillo(AT)lycos.com), Apr 21 2003
