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 A026871 #4 Mar 30 2012 18:56:11 %S A026871 1,11,82,519,3010,16563,88092,457800,2340519,11824761,59217488, %T A026871 294596574,1458173626,7189542273,35341573246,173322863748, %U A026871 848473455491,4147736942919,20254228370249,98824420111063,481889327547656 %N A026871 T(2n,n-3), T given by A026758. %K A026871 nonn %O A026871 3,2 %A A026871 _Clark Kimberling_