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%I #18 Mar 20 2023 05:06:49
%S 9,109,1209,13309,146409,1610509,17715609,194871709,2143588809,
%T 23579476909,259374246009,2853116706109,31384283767209,
%U 345227121439309,3797498335832409,41772481694156509,459497298635721609,5054470284992937709
%N a(n) = 10*11^n-1.
%H Vincenzo Librandi, <a href="/A199030/b199030.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)+10.
%F a(n) = 12*a(n-1)-11*a(n-2).
%F G.f.: (9+x)/((1-x)*(1-11*x)). - _Bruno Berselli_, Nov 03 2011
%o (Magma) [10*11^n-1: n in [0..20]];
%K nonn,easy
%O 0,1
%A _Vincenzo Librandi_, Nov 03 2011
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