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%I #18 Apr 10 2024 03:43:20
%S 1,2,6,19,59,183,568,1763,5472,16984,52715,163617,507835,1576220,
%T 4892277,15184666,47130218,146282931,454033459,1409230595,4373974716,
%U 13575957607,42137103416,130785284964,405931812499,1259932540913,3910582907703,12137680535608
%N a(n) = 3*a(n-1) + a(n-3) with a(0)=1, a(1)=2, a(2)=6.
%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (3,0,1).
%F G.f.: ((1-x)/(1-3*x-x^3).
%F a(n) = A052541(n) - A051541(n-1). - _R. J. Mathar_, Dec 15 2011
%Y Cf. A052541, A193723.
%K easy,nonn,changed
%O 0,2
%A _Philippe Deléham_, Dec 14 2011
%E Corrected by _R. J. Mathar_, Dec 15 2011
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