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%I #14 Apr 10 2019 13:33:08
%S 0,3,6,13,30,70,163,379,881,2048,4761,11068,25730,59815,139053,323259,
%T 751486,1746993,4061266,9441298,21948355,51023735,118615793,275748264,
%U 641036941,1490230088,3464364646,8053670703,18722512905,43524561955,101182330758,235220381269
%N a(n) = 3*a(n-1) - 2*a(n-2) + a(n-3), n > 3.
%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (3, -2, 1).
%F G.f.: -x*(x^2-3*x+3)/(x^3-2*x^2+3*x-1).
%t LinearRecurrence[{3,-2,1},{0,3,6,13},50] (* _Harvey P. Dale_, Jan 28 2013 *)
%K nonn
%O 0,2
%A _Paul Curtz_, Apr 26 2008
%E More terms from _Harvey P. Dale_, Jan 28 2013
%E a(4) = 30 inserted by _Georg Fischer_, Apr 10 2019
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