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 A011582 #21 Oct 21 2022 22:00:42
%S A011582 0,1,-1,1,1,1,-1,-1,-1,1,-1,0,1,-1,1,1,1,-1,-1,-1,1,-1,0,1,-1,1,1,1,
%T A011582 -1,-1,-1,1,-1,0,1,-1,1,1,1,-1,-1,-1,1,-1,0,1,-1,1,1,1,-1,-1,-1,1,-1,
%U A011582 0,1,-1,1,1,1,-1,-1,-1,1,-1,0,1,-1,1,1,1,-1,-1,-1,1,-1,0,1,-1,1
%N A011582 Legendre symbol (n,11).
%D A011582 G. H. Hardy and E. M. Wright, An Introduction to the Theory of Numbers. 3rd ed., Oxford Univ. Press, 1954, p. 68.
%H A011582 <a href="/index/Rec#order_10">Index entries for linear recurrences with constant coefficients</a>, signature (-1,-1,-1,-1,-1,-1,-1,-1,-1,-1).
%t A011582 Table[JacobiSymbol[n, 11], {n, 0, 80}] (* _Jean-François Alcover_, May 17 2017 *)
%o A011582 (PARI) A011582(n) = kronecker(n,11);
%o A011582 for(n=0, 20, print1(A011582(n)", ")); /* _R. J. Mathar_, Feb 25 2012 */
%K A011582 sign,mult,easy
%O A011582 0,1
%A A011582 _N. J. A. Sloane_