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 A026653 #4 Mar 30 2012 18:56:09 %S A026653 1,7,30,148,610,2823,11690,52952,221094,992190,4173708,18642456, %T A026653 78906516,351537963,1495497690,6652572976,28420125190,126308309058, %U A026653 541492971140,2405203008440,10341957297084,45920564571398,197952999374468 %N A026653 a(n) = T(2n-1,n-2), T given by A026648. %K A026653 nonn %O A026653 2,2 %A A026653 _Clark Kimberling_