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 A047122 #4 Mar 30 2012 18:56:53 %S A047122 1,1,3,10,36,129,471,1744,6531,24643,93541,356808,1366632,5252532, %T A047122 20247138,78245742,303053351,1176042891,4571690601,17799156930, %U A047122 69394115895,270886964569,1058633284203,4141439892120,16216887541767 %N A047122 T(n,n), array T as in A047120. %K A047122 nonn %O A047122 0,3 %A A047122 _Clark Kimberling_