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 A047148 #4 Mar 30 2012 18:56:53 %S A047148 1,3,9,38,96,277,1421,2464,6654,61802,293298,977440,3457374,15961755, %T A047148 68638807,261722656,993323854,4081202724,16722068344,65831346572, %U A047148 256639112606,1025719342194,4118393609362,16324710723952 %N A047148 T(n,n+3), array T as in A047140. %K A047148 nonn %O A047148 0,2 %A A047148 _Clark Kimberling_