This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A062038 #3 Mar 30 2012 16:49:06 %S A062038 1,2,8,1,42,12,260,114,4,1796,1030,90,13396,9290,1349,22,105706,84840, %T A062038 17220,728,870772,787082,203568,14884,140,7420836,7415814,2312094, %U A062038 244908,6120,65004584,70867212,25691670,3575045,158354,969 %N A062038 Triangular array T(n,k) giving number of alternating link diagrams with n >= 0 crossings, k = 0..[n/2] connected components and two external legs. %C A062038 Rows have lengths 1,1,2,2,3,3,4,4,... %H A062038 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. %e A062038 1; 2; 8,1; 42,12; 260,114,4; 1796,1030,90; ... %Y A062038 Columns give A054993, A062386, A067767, A067768. %K A062038 nonn,tabf %O A062038 0,2 %A A062038 _N. J. A. Sloane_, Feb 09 2002