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 A048214 #4 Mar 30 2012 18:56:54 %S A048214 3,5,10,14,17,21,27,31,36,42,46,49,51,58,65,67,71,75,79,86,92,95,101, %T A048214 109,115,120,123,126,132,137,143,150,153,155,159,165,171,175,177,185, %U A048214 194,198,203,208,211,216,221,225,233,240,248,255 %N A048214 a(n)=T(n,2), array T given by A048212. %K A048214 nonn %O A048214 2,1 %A A048214 _Clark Kimberling_