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%I #12 Sep 08 2022 08:46:00
%S 4,32,284,2552,22964,206672,1860044,16740392,150663524,1355971712,
%T 12203745404,109833708632,988503377684,8896530399152,80068773592364,
%U 720618962331272,6485570660981444,58370135948832992,525331223539496924
%N (7*9^n+1)/2.
%H Vincenzo Librandi, <a href="/A199566/b199566.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) = 4*A187709(n).
%F a(n) = 9*a(n-1)-4.
%F a(n) = 10*a(n-1)-9*a(n-2).
%F G.f.: 4*(1-2*x)/((1-x)*(1-9*x)).
%t (7*9^Range[0,20]+1)/2 (* or *) LinearRecurrence[{10,-9},{4,32},20] (* _Harvey P. Dale_, Dec 08 2012 *)
%o (Magma) [(7*9^n+1)/2: n in [0..30]];
%K nonn,easy
%O 0,1
%A _Vincenzo Librandi_, Nov 08 2011
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