%I
%S 1,0,0,0,1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,
%T 0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%U 0,0,0,0,0,0,0,0,0,0,0,0,0,0
%N Inverse of 168th cyclotomic polynomial.
%C Periodic with period length 168.  _Ray Chandler_, Apr 03 2017
%H Vincenzo Librandi, <a href="/A014177/b014177.txt">Table of n, a(n) for n = 0..1000</a>
%H <a href="/index/Rec#order_48">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1).
%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[168, 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_
