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A159036 a(0)=0, a(1)=1, a(2)=4, a(3)=13; thereafter a(n+3)=4*a(n+2)-4*a(n+1)+2*a(n) for n>=1.

%I A159036 #17 Apr 07 2024 17:42:24
%S A159036 0,1,4,13,38,108,306,868,2464,6996,19864,56400,160136,454672,1290944,
%T A159036 3665360,10407008,29548480,83896608,238206528,676336640,1920313664,
%U A159036 5452321152,15480703232,43954155648,124798451968,354338591744,1006068870400
%N A159036 a(0)=0, a(1)=1, a(2)=4, a(3)=13; thereafter a(n+3)=4*a(n+2)-4*a(n+1)+2*a(n) for n>=1.
%H A159036 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (4,-4,2).
%F A159036 G.f.: ((z+z^3)/(1-4*z+4*z^2-2*z^3)).
%K A159036 easy,nonn
%O A159036 0,3
%A A159036 _Richard Choulet_, Apr 03 2009
%E A159036 Definition corrected by _Paolo P. Lava_, Apr 06 2009
%E A159036 More terms from _Vincenzo Librandi_, Jun 30 2009