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 A132151 #14 Dec 12 2023 08:54:22 %S A132151 0,1,0,0,0,0,-1,0,0,1,0,0,0,0,-1,0,0,1,0,0,0,0,-1,0,0,1,0,0,0,0,-1,0, %T A132151 0,1,0,0,0,0,-1,0,0,1,0,0,0,0,-1,0,0,1,0,0,0,0,-1,0,0,1,0,0,0,0,-1,0, %U A132151 0,1,0,0,0,0,-1,0,0,1,0,0,0,0,-1,0,0,1,0,0,0,0,-1,0 %N A132151 Period 8: repeat [0, 1, 0, 0, 0, 0, -1, 0]. %H A132151 <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (-1,-1,-1,-1,-1,-1,-1). %F A132151 a(n) = floor((n-1)/8) - floor((n-2)/8) - floor((n-6)/8) + floor((n-7)/8). - _Wesley Ivan Hurt_, Sep 01 2019 %o A132151 (PARI) a(n)=if(n%8==1,1,n%8==6,-1,0) \\ _Charles R Greathouse IV_, Jul 13 2016 %K A132151 sign,easy %O A132151 0,1 %A A132151 _Paul Curtz_, Nov 01 2007