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 A334090 #9 Apr 18 2020 19:44:42 %S A334090 0,1,1,0,1,0,1,-1,1,0,1,-1,1,0,0,-1,1,0,1,-1,1,0,1,-2,1,0,0,0,1,-1,1, %T A334090 -2,2,-1,1,-1,1,0,0,-1,1,0,1,-1,0,1,1,-3,2,-1,0,0,1,-1,1,-1,1,0,1,-2, %U A334090 1,0,0,-2,2,0,1,-2,2,-1,1,-2,1,0,0,0,1,-1,1,-2,1,0,1,-1,0,1,0,-1,1,-1,1,0,0,1,-1,-2,1,1,0,-1,1,-1,1,-1,1 %N A334090 a(1) = 0, and then after the first differences of A064097. %H A334090 Antti Karttunen, <a href="/A334090/b334090.txt">Table of n, a(n) for n = 1..65537</a> %F A334090 a(1) = 0, and for n > 1, a(n) = A064097(n) - A064097(n-1). %F A334090 a(n) = A334091(n) + A334195(n). %o A334090 (PARI) %o A334090 A064097(n) = if(1==n,0,1+A064097(n-(n/vecmin(factor(n)[,1])))); %o A334090 A334090(n) = if(1==n,0,A064097(n)-A064097(n-1)); %Y A334090 Cf. A064097, A334091, A334195. %Y A334090 Cf. A334197 (positions of records). %Y A334090 Cf. also A332903. %K A334090 sign %O A334090 1,24 %A A334090 _Antti Karttunen_, Apr 17 2020