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 A020507 #15 Feb 26 2024 10:59:21
%S A020507 -8,-9,-7,57,65,3641,73,233017,4097,261633,4681,954437177,4033,
%T A020507 61083979321,299593,18837001,16777217,250199979298361,262657,
%U A020507 16012798675095097,16519105,77158673929,1227133513
%N A020507 Cyclotomic polynomials at x=-8.
%H A020507 Paolo Xausa, <a href="/A020507/b020507.txt">Table of n, a(n) for n = 0..1000</a>
%H A020507 <a href="/index/Cy#CyclotomicPolynomialsValuesAtX">Index entries for cyclotomic polynomials, values at X</a>
%p A020507 with(numtheory,cyclotomic); f := n->subs(x=-8,cyclotomic(n,x)); seq(f(i),i=0..64);
%t A020507 Join[{-8}, Cyclotomic[Range[50], -8]] (* _Paolo Xausa_, Feb 26 2024 *)
%K A020507 sign
%O A020507 0,1
%A A020507 _Simon Plouffe_