Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #4 Mar 30 2012 16:49:06
%S 1,12,114,1030,9290,84840,787082,7415814,70867212,685839770,
%T 6712285600,66349573368,661680191832,6651030871168,67329662060890,
%U 685953949494774,7028941367108708,72403769391718890
%N Number of alternating link diagrams with n crossings, 1 connected component 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 2,2
%A _N. J. A. Sloane_, Feb 09 2002