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 A026879 #4 Mar 30 2012 18:56:11 %S A026879 1,9,56,300,1488,7061,32617,148166,666122,2976438,13256927,58977774, %T A026879 262470955,1169754507,5224863646,23403066235,105163633173, %U A026879 474212892828,2146200885977,9749771934555,44458458762351,203486694636257,934775275401371 %N A026879 T(2n+1,n+4), T given by A026758. %K A026879 nonn %O A026879 3,2 %A A026879 _Clark Kimberling_