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 A102864 #3 Mar 30 2012 16:50:10 %S A102864 2,2,4,16,28,56,108,216,424,848,1684,3368,6712,13424,26808,53616, %T A102864 107152,214304,428460,856920,1713544,3427088 %N A102864 Leading column of A102416. %K A102864 nonn %O A102864 0,1 %A A102864 _N. J. A. Sloane_, Mar 17 2005