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 A140739 #2 Mar 31 2012 10:22:09 %S A140739 14,10,1,12,1,14,3,12,1,21,15,1,4,24,5,19,8,13,10,10,4,7,10,16,34,4,5, %T A140739 14,8,12,10,13,3,2,22,12,1,12,22,6,25 %N A140739 First differences of A140738. %Y A140739 Cf. A139640, A140738. %K A140739 nonn %O A140739 1,1 %A A140739 _Artur Jasinski_, May 26 2008