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11*6^n+1.
1

%I #13 Sep 08 2022 08:46:00

%S 12,67,397,2377,14257,85537,513217,3079297,18475777,110854657,

%T 665127937,3990767617,23944605697,143667634177,862005805057,

%U 5172034830337,31032208982017,186193253892097,1117159523352577,6702957140115457,40217742840692737

%N 11*6^n+1.

%H Vincenzo Librandi, <a href="/A199415/b199415.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 (7,-6).

%F a(n) = 6*a(n-1)-5.

%F a(n) = 7*a(n-1)-6*a(n-2).

%F G.f.: (12-17*x)/((1-x)*(1-6*x)).

%t 11*6^Range[0,30]+1 (* or *) LinearRecurrence[{7, -6}, {12, 67}, 30] (* _Harvey P. Dale_, Mar 26 2012 *)

%o (Magma) [11*6^n+1: n in [0..30]];

%K nonn,easy

%O 0,1

%A _Vincenzo Librandi_, Nov 06 2011