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 A019275 #21 Feb 13 2015 17:35:57 %S A019275 1,2,4,38,132,420,1426,4834,16796,58688,208012,742636,2674384,9693976, %T A019275 35357670,129641774 %N A019275 Incorrect version of A035010. %C A019275 The term 14 is missing here. %K A019275 dead %O A019275 1,2 %A A019275 Vincent Blondel (blondel(AT)ulg.ac.be)