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 A072786 #2 May 01 2014 02:47:43 %S A072786 0,0,0,-1,0,0,1,0,0,0,-1,-1,0,0,0,1,1,0,0,0,0,-1,-1,-1,0,0,0,0,1,1,1, %T A072786 0,0,0,0,0,-1,-1,-1,-1,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,-1,-1,-1,-1,-1,0, %U A072786 0,0,0,0,0,1,1,1,1,1,0,0,0,0,0,0,0,-1,-1,-1,-1,-1,-1,0,0,0,0,0,0,0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,-1,-1,-1,-1,-1,-1,-1,0 %N A072786 Differences between A072782 and A072739. %o A072786 (Scheme) (define (A072786 n) (- (A072782 n) (A072739 n))) %K A072786 sign,tabl %O A072786 0,1 %A A072786 _Antti Karttunen_, Jun 12 2002