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 A027020 #4 Mar 30 2012 18:56:13 %S A027020 1,3,4,7,15,28,47,98,199,373,661,1404,2801,5283,9859,20495,40615, %T A027020 77040,147760,303553,599801,1143134,2228414,4544731,8968421,17160232, %U A027020 33801192,68602923,135308317,259763268,515250948,1042217402,2055373383 %N A027020 a(n) = greatest number in row n of array T given by A027011. %K A027020 nonn %O A027020 1,2 %A A027020 _Clark Kimberling_