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 A027418 #4 May 11 2007 03:00:00 %S A027418 0,2,7,20,54,143,376,986,2583,6764,17710,46367,121392,317810 %N A027418 Duplicate of A035508. %Y A027418 Bisection of A000071 and A007492. Pairwise sums of A059840. %K A027418 dead %O A027418 1,2