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 A054074 #4 Mar 30 2012 18:57:01 %S A054074 1,2,5,8,13,18,24,32,40,50,60,71,84,97,112,127,144,161,179,199,219, %T A054074 241,263,286,311,336,363,390,419,448,478,510,542,576,610,645,682,719, %U A054074 758,797,837,879,921,965,1009,1055,1101,1148,1197 %N A054074 Position of n-th 1 in A054073. %K A054074 nonn %O A054074 1,2 %A A054074 _Clark Kimberling_