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%I #11 Sep 08 2022 08:46:07
%S 1,-1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%T 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%U 0,0,0,1,-1,0,0,0,0,0,0,0,0,0,0,0,0,0,0
%N Inverse of 71st cyclotomic polynomial.
%C Periodic with period length 71. - _Ray Chandler_, Apr 03 2017
%H Vincenzo Librandi, <a href="/A240354/b240354.txt">Table of n, a(n) for n = 0..1000</a>
%H <a href="/index/Rec#order_70">Index entries for linear recurrences with constant coefficients</a>, signature (-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1).
%H <a href="/index/Pol#poly_cyclo_inv">Index to sequences related to inverse of cyclotomic polynomials</a>
%t CoefficientList[Series[1/Cyclotomic[71, x], {x, 0, 200}], x]
%o (Magma) &cat[[n le 2 select -(-1)^(n) else 0: n in [1..71]]: m in [1..4]];
%Y Cf. similar sequences listed in A240328.
%K sign,easy
%O 0
%A _Vincenzo Librandi_, Apr 04 2014