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%I #4 Mar 30 2012 16:49:18
%S 4,90,1349,17220,203568,2312094,25691670,282000444,3074136464,
%T 33387698708,361969672904,3921901043440,42499598861832,
%U 460831546801414,5001468564165262,54341248085414380
%N Number of alternating link diagrams with n crossings, 2 connected components and two external legs.
%H J. L. Jacobsen and P. Zinn-Justin, <a href="http://arXiv.org/abs/math-ph/0104009">A Transfer Matrix approach to the Enumeration of Colored Links</a>, J. Knot Theory, 10 (2001), 1233-1267.
%Y A column of A062038.
%K nonn
%O 4,1
%A _N. J. A. Sloane_, Feb 09 2002
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