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 A072783 #2 May 01 2014 02:47:42 %S A072783 0,0,0,-1,0,0,-1,1,0,0,-1,1,0,0,0,-1,1,0,0,0,0,-1,1,-1,0,0,0,0,-1,1, %T A072783 -1,1,0,0,0,0,-1,1,-1,1,0,0,0,0,0,-1,1,-1,1,0,0,0,0,0,0,-1,1,-1,1,-1, %U A072783 0,0,0,0,0,0,-1,1,-1,1,-1,1,0,0,0,0,0,0,-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 A072783 Differences between A072740 and A072736. %o A072783 (Scheme) (define (A072783 n) (- (A072740 n) (A072736 n))) %K A072783 sign,tabl %O A072783 0,1 %A A072783 _Antti Karttunen_, Jun 12 2002