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 A132401 #9 Dec 12 2023 08:55:14 %S A132401 0,0,1,1,2,-1,-1,-2,0,0,1,1,2,-1,-1,-2,0,0,1,1,2,-1,-1,-2,0,0,1,1,2, %T A132401 -1,-1,-2,0,0,1,1,2,-1,-1,-2,0,0,1,1,2,-1,-1,-2,0,0,1,1,2,-1,-1,-2,0, %U A132401 0,1,1,2,-1,-1,-2,0,0,1,1,2,-1,-1,-2,0,0,1,1,2,-1,-1,-2,0,0,1,1,2,-1,-1,-2,0,0,1,1,2,-1,-1,-2,0,0,1,1,2,-1,-1,-2,0,0,1,1,2 %N A132401 Period 8: repeat 0, 0, 1, 1, 2, -1, -1, -2. %H A132401 <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (-1,-1,-1,-1,-1,-1,-1). %o A132401 (PARI) a(n)=[0, 0, 1, 1, 2, -1, -1, -2][n%8+1] \\ _Charles R Greathouse IV_, Jul 13 2016 %Y A132401 Cf. A132367. %K A132401 sign,easy %O A132401 0,5 %A A132401 _Paul Curtz_, Nov 12 2007