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a(n) = 3*5^n+1.
1

%I #18 Mar 20 2023 11:52:01

%S 4,16,76,376,1876,9376,46876,234376,1171876,5859376,29296876,

%T 146484376,732421876,3662109376,18310546876,91552734376,457763671876,

%U 2288818359376,11444091796876,57220458984376,286102294921876,1430511474609376

%N a(n) = 3*5^n+1.

%H Vincenzo Librandi, <a href="/A199214/b199214.txt">Table of n, a(n) for n = 0..1000</a>

%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (6,-5).

%F a(n) = 4*A083065(n).

%F a(n) = 5*a(n-1)-4.

%F a(n) = 6*a(n-1)-5*a(n-2).

%F G.f.: 4*(1-2*x)/((1-x)*(1-5*x)). - _Bruno Berselli_, Nov 04 2011

%t LinearRecurrence[{6,-5},{4,16},30] (* _Harvey P. Dale_, Jul 08 2013 *)

%o (Magma) [3*5^n+1: n in [0..30]];

%Y Cf. A083065.

%K nonn,easy

%O 0,1

%A _Vincenzo Librandi_, Nov 04 2011