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 A087158 #3 Mar 30 2012 18:36:38 %S A087158 1,2,4,7,9,13,15,17,20,22,27,29,31,33,36,38,41,43,47,49,51,54,56,62, %T A087158 64,66,68,70,73,75,78,80,83,85,89,91,93,96,98,102,104,106,109,111,116, %U A087158 118,120,122,125,127,130,132,136,138,140,143,145,152,154,156 %N A087158 Satisfies a(n+2)=a(n+1)+A087157(n)+1. %Y A087158 Cf. A087157. %K A087158 nonn %O A087158 1,2 %A A087158 _Paul D. Hanna_, Aug 22 2003