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 A020510 #15 Feb 26 2024 10:59:41
%S A020510 -11,-12,-10,111,122,13421,133,1623931,14642,1770231,16105,
%T A020510 23775972551,14521,2876892678661,1948717,233669041,214358882,
%U A020510 42120585708274481,1772893,5096590870701212191,212601841
%N A020510 Cyclotomic polynomials at x=-11.
%H A020510 Paolo Xausa, <a href="/A020510/b020510.txt">Table of n, a(n) for n = 0..900</a>
%H A020510 <a href="/index/Cy#CyclotomicPolynomialsValuesAtX">Index entries for cyclotomic polynomials, values at X</a>
%p A020510 with(numtheory,cyclotomic); f := n->subs(x=-11,cyclotomic(n,x)); seq(f(i),i=0..64);
%t A020510 Join[{-11}, Cyclotomic[Range[30], -11]] (* _Paolo Xausa_, Feb 26 2024 *)
%K A020510 sign
%O A020510 0,1
%A A020510 _Simon Plouffe_