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 A047115 #4 Mar 30 2012 18:56:53 %S A047115 1,4,14,44,144,414,1348,3187,11000,67699,242110,907470,4048716, %T A047115 15792744,61270714,251463726,996295359,3916971576,15685208519, %U A047115 62232260683,245848928006,977038778501,3873954187845,15330413916232 %N A047115 T(n,n-3), array T as in A047110. %K A047115 nonn %O A047115 3,2 %A A047115 _Clark Kimberling_