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 A072769 #2 May 01 2014 02:47:42 %S A072769 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, %T A072769 0,0,1,0,0,0,0,0,0,0,1,0,1,0,0,0,0,0,0,1,0,-1,0,1,0,0,0,0,0,1,0,-1,0, %U A072769 -1,0,1,0,0,0,0,1,0,-1,0,0,0,-1,0,1,0,0,0,1,0,-1,0,0,1,0,0,-1,0,1,0,0,1,0,-1,0,0,1,0,1,0,0,-1,0,1,0,1,0,-1,0,0,1,0 %N A072769 Differences between A071673 and A072768. %C A072769 The term a(0) = A071673(0)-A072768(0) = 0-0 = 0 is not explicitly listed here as to get a better looking triangle. %o A072769 (Scheme) (define (A072769 n) (- (A071673 n) (A072768 n))) %K A072769 sign,tabl %O A072769 1,1 %A A072769 _Antti Karttunen_, Jun 12 2002