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 A135264 a(n) = 3*A132357(n). 1

%I

%S 3,12,42,123,366,1092,3279,9840,29526,88575,265722,797160,2391483,

%T 7174452,21523362,64570083,193710246,581130732,1743392199,5230176600,

%U 15690529806,47071589415,141214768242,423644304720,1270932914163

%N a(n) = 3*A132357(n).

%C Digital roots yield a hexaperiodic sequence A010888(a(n))= 3*A135265(n+1).

%H G. C. Greubel, <a href="/A135264/b135264.txt">Table of n, a(n) for n = 0..1000</a>

%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (3,0,-1,3).

%F a(n) = 3*a(n-1) - a(n-3) + 3*a(n-4).

%F G.f.: 3*(1 + x + 2*x^2)/(1 - 3*x + x^3 - 3*x^4). - _G. C. Greubel_, Oct 07 2016 [corrected by _Georg Fischer_, May 10 2019]

%t LinearRecurrence[{3, 0, -1, 3}, {3, 12, 42, 123}, 25] (* _G. C. Greubel_, Oct 07 2016 *)

%K nonn,less,easy

%O 0,1

%A _Paul Curtz_, Dec 02 2007

%E Edited, corrected and extended by _R. J. Mathar_, Jul 28 2008

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Last modified September 21 11:45 EDT 2019. Contains 327253 sequences. (Running on oeis4.)