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 A102565 #5 May 02 2021 20:58:15 %S A102565 0,0,1,-2,1,-2,-1,0,1,-2,-1,0,-1,0,1,-2,1,-2,-1,0,-1,0,1,-2,-1,0,1,-2, %T A102565 1,-2,-1,0,1,-2,-1,0,-1,0,1,-2,-1,0,1,-2,1,-2,-1,0,-1,0,1,-2,1,-2,-1, %U A102565 0,1,-2,-1,0,-1,0,1,-2,1,-2,-1,0,-1,0,1,-2,-1,0,1,-2,1,-2,-1,0,-1,0,1,-2,1,-2,-1,0,1,-2,-1,0,-1,0,1,-2,-1,0,1,-2,1 %N A102565 a(n) = A102563(n) - A102564(n). %C A102565 It would appear that a(2n+1) = (-2)*A010060(n); a(4n+1) = (-2)*A010060(n); a(8n+1) = (-2)*A010060(n); a(2^n) = 0^n-1; a(2^n+1) = 3*0^n-2; a(2^(n+1)-1) = -(1-(-1)^n). %Y A102565 Cf. A010060, A076826, A102563, A102564. %K A102565 easy,sign %O A102565 0,4 %A A102565 _Paul Barry_, Jan 14 2005