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 A054087 #4 Mar 30 2012 18:57:01 %S A054087 1,4,6,9,12,15,17,20,23,25,28,31,34,36,39,42,45,47,50,53,56,58,61,64, %T A054087 66,69,72,75,77,80,83,86,88,91,94,96,99,102,105,107,110,113,116,118, %U A054087 121,124,127,129,132,135,137,140,143,146,148,151 %N A054087 s(3n-2), s=A054086; also a bisection of A003511. %K A054087 nonn %O A054087 1,2 %A A054087 _Clark Kimberling_