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%I #15 Mar 25 2023 22:27:54
%S 4,39,424,4659,51244,563679,6200464,68205099,750256084,8252816919,
%T 90780986104,998590847139,10984499318524,120829492503759,
%U 1329124417541344,14620368592954779,160824054522502564,1769064599747528199
%N a(n) = (7*11^n+1)/2.
%H Vincenzo Librandi, <a href="/A199757/b199757.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.: (4-9*x)/((1-x)*(1-11*x)).
%t (7*11^Range[0,20]+1)/2 (* or *) LinearRecurrence[{12,-11},{4,39},20] (* _Harvey P. Dale_, Dec 30 2017 *)
%o (Magma) [(7*11^n+1)/2: n in [0..30]];
%K nonn
%O 0,1
%A _Vincenzo Librandi_, Nov 10 2011
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