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%I #16 Sep 08 2022 08:45:59
%S 4,14,44,134,404,1214,3644,10934,32804,98414,295244,885734,2657204,
%T 7971614,23914844,71744534,215233604,645700814,1937102444,5811307334,
%U 17433922004,52301766014,156905298044,470715894134,1412147682404,4236443047214
%N a(n) = 5*3^n-1.
%H Vincenzo Librandi, <a href="/A198643/b198643.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 (4,-3).
%F a(n) = 3*a(n-1)+2 = 2*A060816(n+1).
%F G.f.: ( 4-2*x ) / ( (3*x-1)*(x-1) ). - _R. J. Mathar_, Nov 17 2011
%o (Magma) [5*3^n-1: n in [0..30]]
%o (PARI) a(n)=5*3^n-1 \\ _Charles R Greathouse IV_, Oct 07 2015
%Y Cf. A027107, A048473, A171498.
%K nonn,easy
%O 0,1
%A _Vincenzo Librandi_, Oct 28 2011
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