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 A026886 #4 Mar 30 2012 18:56:11 %S A026886 1,10,67,380,1978,9814,47391,225590,1067527,5051454,24001979, %T A026886 114858924,554704282,2707092726,13359365962,66678605418,336519708452, %U A026886 1716476383658,8842304168692,45966748864706,240938394287134,1272300373503706 %N A026886 T(2n,n+4), T given by A026769. %K A026886 nonn %O A026886 4,2 %A A026886 _Clark Kimberling_