%I #12 Sep 08 2022 08:46:00
%S 3,25,223,2005,18043,162385,1461463,13153165,118378483,1065406345,
%T 9588657103,86297913925,776681225323,6990131027905,62911179251143,
%U 566200613260285,5095805519342563,45862249674083065,412760247066747583
%N (11*9^n+1)/4.
%H Vincenzo Librandi, <a href="/A199679/b199679.txt">Table of n, a(n) for n = 0..1000</a>
%H <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (10,-9).
%F a(n) = 9*a(n-1)-2.
%F a(n) = 10*a(n-1)-9*a(n-2).
%F G.f.: (3-5*x)/((1-x)*(1-9*x)).
%t (11 9^Range[0,20]+1)/4 (* or *) LinearRecurrence[{10,-9},{3,25},20] (* _Harvey P. Dale_, Apr 29 2019 *)
%o (Magma) [(11*9^n+1)/4: n in [0..30]];
%K nonn,easy
%O 0,1
%A _Vincenzo Librandi_, Nov 09 2011