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10*9^n+1.
1

%I #10 Sep 08 2022 08:46:00

%S 11,91,811,7291,65611,590491,5314411,47829691,430467211,3874204891,

%T 34867844011,313810596091,2824295364811,25418658283291,

%U 228767924549611,2058911320946491,18530201888518411,166771816996665691,1500946352969991211

%N 10*9^n+1.

%H Vincenzo Librandi, <a href="/A199678/b199678.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)-8.

%F a(n) = 10*a(n-1)-9*a(n-2).

%F G.f.: (11-19*x)/((1-x)*(1-9*x)).

%o (Magma) [10*9^n+1: n in [0..30]];

%K nonn,easy

%O 0,1

%A _Vincenzo Librandi_, Nov 09 2011