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 A094578 #4 Mar 30 2012 16:49:56 %S A094578 0,0,1,4,19,76,316,1264,5101,20404,81796,327184,1309444,5237776, %T A094578 20953936,83815744,335274259,1341097036,5364433276,21457733104, %U A094578 85831112764,343324451056,1373298525616,5493194102464,21972779294716 %N A094578 A094559/4. %K A094578 nonn,easy %O A094578 0,4 %A A094578 _N. J. A. Sloane_, Jun 06 2004 %E A094578 More terms from Brian Kuehn (brk158(AT)psu.edu), Apr 20 2006