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 A281772 #9 Feb 28 2017 22:59:30 %S A281772 0,1,0,1,-1,0,1,-1,0,-1,0,1,0,1,-1,0,1,-1,0,1,-1,0,-2,0,1,0,1,-1,0,1, %T A281772 -1,0,1,0,-1,0,1,-1,0,1,-1,0,1,-1,0,1,-1,0,1,0,-1,0,1,-1,0,1,-1,0,1, %U A281772 -1,0,1,-1,0,1,-4,0,1,-1,0,1,0,1,-2,0,1,-1,0,1 %N A281772 a(n)=common difference of the n-th run of consecutive terms in arithmetic progression in A281579. %C A281772 All terms are less than or equal to 1, and a(n)=1 implies a(n-1)=0. %C A281772 There are no consecutive equal terms. %H A281772 Rémy Sigrist, <a href="/A281772/b281772.txt">Table of n, a(n) for n = 1..10000</a> %Y A281772 Cf. A281579 %K A281772 sign %O A281772 1,23 %A A281772 _Rémy Sigrist_, Jan 29 2017