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%I #20 Jan 02 2024 08:54:31
%S 0,0,0,1,3,9,26,78,234,703,2109,6327,18980,56940,170820,512461,
%T 1537383,4612149,13836446,41509338,124528014,373584043,1120752129,
%U 3362256387,10086769160,30260307480,90780922440,272342767321,817028301963,2451084905889,7353254717666
%N a(n) = 3*a(n-1) - a(n-3) + 3*a(n-4).
%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (3,0,-1,3).
%F O.g.f.: -x^3/((3*x-1)*(x+1)*(x^2-x+1)) = -(1/28)/(3*x-1)-(1/12)/(x+1)+(1/21)*(-5*x+1)/(x^2-x+1). - _R. J. Mathar_, Nov 28 2007
%t LinearRecurrence[{3, 0, -1, 3}, {0, 0, 0, 1}, 60] (* _Vladimir Joseph Stephan Orlovsky_, Jun 20 2011 *)
%K nonn
%O 0,5
%A _Paul Curtz_, Nov 24 2007
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