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%I #15 Jan 03 2024 08:43:52
%S 1,9,-72,-801,5031,69912,-337599,-6000471,21345048,507383199,
%T -1221565689,-42319604808,56627216001,3484515205449,-1102289290632,
%U -283348020932001,-194062588390809,22757127107101272,38476196766756801,-1804851098908446231
%N a(n) = a(n-1) - 81*a(n-2), a(0)=1, a(1)=9.
%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (1,-81).
%F G.f.: (1+8*x)/(1-x+81*x^2).
%F a(n) = Sum_{k=0..n} A133607(n,k)*9^k. - _Philippe Deléham_, Dec 30 2007
%t LinearRecurrence[{1,-81},{1,9},30] (* _Harvey P. Dale_, Aug 01 2016 *)
%K easy,sign
%O 0,2
%A _Philippe Deléham_, Dec 29 2007
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