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 A027039 #5 Mar 30 2012 18:56:13 %S A027039 1,1,3,5,13,33,85,221,597,1655,4593,12775,35629,99651,279501,786071, %T A027039 2252509,6460433,18542169,53260481,153115765,440572993,1268830877, %U A027039 3657435745,10551936125,30469329025,88056216233,256521698097 %N A027039 a(n) = greatest number in row n of array T given by A027023. %K A027039 nonn %O A027039 0,3 %A A027039 _Clark Kimberling_