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%I #17 Sep 08 2022 08:46:00
%S 4,49,544,5989,65884,724729,7972024,87692269,964614964,10610764609,
%T 116718410704,1283902517749,14122927695244,155352204647689,
%U 1708874251124584,18797616762370429,206773784386074724,2274511628246821969
%N (9*11^n-1)/2.
%H Vincenzo Librandi, <a href="/A199028/b199028.txt">Table of n, a(n) for n = 0..900</a>
%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (12,-11).
%F a(n) = 11*a(n-1)+5.
%F a(n) = 12*a(n-1)-11*a(n-2).
%F G.f.: (4 + x)/(1 - 12*x + 11*x^2). - _Vincenzo Librandi_, Jan 04 2013
%t CoefficientList[Series[(4 + x)/(1 - 12 x + 11 x^2), {x, 0, 30}], x] (* _Vincenzo Librandi_, Jan 04 2013 *)
%o (Magma) [(9*11^n-1)/2: n in [0..20]];
%K nonn,easy
%O 0,1
%A _Vincenzo Librandi_, Nov 02 2011
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