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%I #13 Sep 08 2022 08:46:00
%S 11,111,1211,13311,146411,1610511,17715611,194871711,2143588811,
%T 23579476911,259374246011,2853116706111,31384283767211,
%U 345227121439311,3797498335832411,41772481694156511,459497298635721611,5054470284992937711
%N 10*11^n+1.
%H Vincenzo Librandi, <a href="/A199764/b199764.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.: (11-21*x)/((1-x)*(1-11*x)).
%t NestList[11#-10&,11,20] (* or *) LinearRecurrence[{12,-11},{11,111},20] (* _Harvey P. Dale_, Aug 28 2021 *)
%o (Magma) [10*11^n+1: n in [0..20]];
%K nonn,easy
%O 0,1
%A _Vincenzo Librandi_, Nov 10 2011
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