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 A011584 #18 Apr 12 2020 08:42:19
%S A011584 0,1,1,-1,1,-1,-1,-1,1,1,-1,-1,-1,1,-1,1,1,0,1,1,-1,1,-1,-1,-1,1,1,-1,
%T A011584 -1,-1,1,-1,1,1,0,1,1,-1,1,-1,-1,-1,1,1,-1,-1,-1,1,-1,1,1,0,1,1,-1,1,
%U A011584 -1,-1,-1,1,1,-1,-1,-1,1,-1,1,1,0,1,1,-1,1,-1,-1,-1,1,1,-1,-1,-1
%N A011584 Legendre symbol (n,17).
%D A011584 G. H. Hardy and E. M. Wright, An Introduction to the Theory of Numbers. 3rd ed., Oxford Univ. Press, 1954, p. 68.
%H A011584 <a href="/index/Rec#order_16">Index entries for linear recurrences with constant coefficients</a>, signature (-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1).
%t A011584 Table[JacobiSymbol[n, 17], {n, 0, 80}] (* _Jean-François Alcover_, May 17 2017 *)
%o A011584 (PARI) A011584(n) = kronecker(n,17) ;
%o A011584 for(n=0,20,print1(A011584(n)",") ); /* _R. J. Mathar_, Feb 25 2012 */
%K A011584 sign,mult
%O A011584 0,1
%A A011584 _N. J. A. Sloane_