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 A047102 #4 Mar 30 2012 18:56:53 %S A047102 1,1,3,11,37,131,481,1778,6637,25010,94819,361275,1382507,5309449, %T A047102 20452432,78991548,305779341,1186056909,4608647096,17936112649, %U A047102 69903546693,272788289379,1065751393409,4168163479770,16317475606787 %N A047102 T(n,n), array T as in A047100. %K A047102 nonn %O A047102 0,3 %A A047102 _Clark Kimberling_