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 A026896 #4 Mar 30 2012 18:56:11 %S A026896 1,9,57,316,1647,8330,41558,206418,1026392,5126109,25763881,130446758, %T A026896 665644541,3423360416,17740450004,92599616864,486607242642, %U A026896 2573051443194,13683364565774,73146530405912,392867752273562,2119154966713452 %N A026896 T(2n,n+3), T given by A026780. %K A026896 nonn %O A026896 3,2 %A A026896 _Clark Kimberling_