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 A047113 #4 Mar 30 2012 18:56:53 %S A047113 1,2,5,10,29,164,534,1839,7813,28888,106712,423250,1621048,6175114, %T A047113 24116312,93457176,361166949,1408515216,5488264319,21368029926, %U A047113 83497729588,326481132377,1276713094911,5001089844661,19605767057292 %N A047113 T(n,n-1), array T as in A047110. %K A047113 nonn %O A047113 1,2 %A A047113 _Clark Kimberling_