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Periodic with period length 42. - Ray Chandler, Apr 03 2017
<a href="/index/Pol#poly_cyclo_inv">Index to sequences related to inverse of cyclotomic polynomials</a>
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<a href="/index/Rec#order_12">Index entries for linear recurrences with constant coefficients</a>, signature (-1, 0, 1, 1, 0, -1, 0, 1, 1, 0, -1, -1).
LinearRecurrence[{-1, 0, 1, 1, 0, -1, 0, 1, 1, 0, -1, -1}, {1, -1, 1, 0, 0, 0, 0, 1, -1, 1, 0, 0}, 81] (* Ray Chandler, Sep 15 2015 *)
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