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%I #15 Jan 02 2024 08:55:31
%S 1,4,-12,-76,116,1332,-524,-21836,-13452,335924,551156,-4823628,
%T -13642124,63535924,281809908,-734764876,-5243723404,6512514612,
%U 90412089076,-13788144716,-1460381569932,-1239771254476,22126333864436,41962673936052
%N a(n) = a(n-1) - 16*a(n-2), a(0)=1, a(1)=4.
%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (1, -16).
%F G.f.: (1+3*x) / (1-x+16*x^2).
%F a(n) = Sum_{k=0..n} A133607(n,k)*4^k. - _Philippe Deléham_, Dec 29 2007
%K easy,sign
%O 0,2
%A _Philippe Deléham_, Dec 28 2007, corrected Jan 04 2008
%E a(19) corrected and more terms from _Sean A. Irvine_, May 19 2019