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 A026859 #4 Mar 30 2012 18:56:11 %S A026859 1,15,141,1070,7187,44673,263431,1496218,8266100,44718596,238015318, %T A026859 1250656153,6504202391,33543967700,171810543570,875006817465, %U A026859 4435130657170,22390449598704,112654298838120,565172299571352 %N A026859 T(2n,n-4), T given by A026747. %K A026859 nonn %O A026859 4,2 %A A026859 _Clark Kimberling_