%I #18 Apr 03 2017 15:19:10
%S 1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
%T -1,-1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%U 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
%N Inverse of 221st cyclotomic polynomial.
%C Periodic with period length 221. - _Ray Chandler_, Apr 03 2017
%H Vincenzo Librandi, <a href="/A014230/b014230.txt">Table of n, a(n) for n = 0..1000</a>
%H <a href="/index/Rec#order_192">Index entries for linear recurrences with constant coefficients</a>, order 192.
%H <a href="/index/Pol#poly_cyclo_inv">Index to sequences related to inverse of cyclotomic polynomials</a>
%p with(numtheory,cyclotomic); c := n->series(1/cyclotomic(n,x),x,80);
%t CoefficientList[Series[1/Cyclotomic[221, x], {x, 0, 200}], x] (* _Vincenzo Librandi_, Apr 06 2014 *)
%Y Cf. similar sequences listed in A240328, A240467.
%K sign,easy
%O 0,1
%A _Simon Plouffe_