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 A047005 #4 Mar 30 2012 18:56:51 %S A047005 1,2,3,14,30,143,728,3148,13566,56221,231308,939090,3793530,15237792, %T A047005 61020524,243678476,971345694,3866131073,15371516800,61064462784, %U A047005 242432019936,962016777729,3816117832536,15133756472226 %N A047005 T(n,n-3), array T given by A047000. %K A047005 nonn %O A047005 3,2 %A A047005 _Clark Kimberling_