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 A161433 #2 Mar 30 2012 17:34:00 %S A161433 4,4,11,4 %N A161433 a(n) = A161431(n+1)/6. %Y A161433 Cf. A139251, A160123, A161430, A161431, A161432. %K A161433 more,nonn %O A161433 1,1 %A A161433 _Omar E. Pol_, Jun 17 2009