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%I #16 Aug 26 2024 15:50:35
%S 3,11,51,251,1251,6251,31251,156251,781251,3906251,19531251,97656251,
%T 488281251,2441406251,12207031251,61035156251,305175781251,
%U 1525878906251,7629394531251,38146972656251,190734863281251,953674316406251
%N a(n) = 2*5^n+1.
%H Vincenzo Librandi, <a href="/A199212/b199212.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 (6,-5).
%F a(n) = 5*a(n-1)-4.
%F a(n) = 6*a(n-1)-5*a(n-2).
%F G.f.: (3-7*x)/((1-x)*(1-5*x)). - _Bruno Berselli_, Nov 04 2011
%t 2*5^Range[0,30]+1 (* or *) LinearRecurrence[{6,-5},{3,11},30] (* _Harvey P. Dale_, Aug 26 2024 *)
%o (Magma) [2*5^n+1: n in [0..30]];
%K nonn,easy
%O 0,1
%A _Vincenzo Librandi_, Nov 04 2011