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 A128933 #3 Mar 30 2012 16:50:41 %S A128933 2,4,10,28,70,430,1060,56500,166840,5020060,7681810,274343590, %T A128933 8316187180 %N A128933 A103828(n) + 1. %K A128933 nonn %O A128933 1,1 %A A128933 _N. J. A. Sloane_, Apr 28 2007