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 A031119 #4 Mar 30 2012 18:56:21 %S A031119 11,18,21,26,28,63,65,103,109,125,127,147,165,176,187,215,218,244,248, %T A031119 249,251,288,291,296,305,319,346,353,355,361,366,370,373,390,406,411, %U A031119 412,417,428,443,450,456,467,470,477,489,503 %N A031119 Position of n-th 7 in A031111. %K A031119 nonn %O A031119 1,1 %A A031119 _Clark Kimberling_