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%I #10 Jun 13 2015 00:50:15
%S 4,13,28,52,91,154,256,421,688,1120,1819,2950,4780,7741,12532,20284,
%T 32827,53122,85960,139093,225064,364168,589243,953422,1542676,2496109,
%U 4038796,6534916,10573723,17108650,27682384,44791045,72473440,117264496,189737947
%N 3*Fibonacci(n) - 11.
%H Colin Barker, <a href="/A054968/b054968.txt">Table of n, a(n) for n = 5..1000</a>
%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (2,0,-1).
%F a(n) = 2*a(n-1)-a(n-3). - _Colin Barker_, Dec 01 2014
%F G.f.: x^5*(2*x^2+5*x+4) / ((x-1)*(x^2+x-1)). - _Colin Barker_, Dec 01 2014
%o (PARI) Vec(x^5*(2*x^2+5*x+4)/((x-1)*(x^2+x-1)) + O(x^100)) \\ _Colin Barker_, Dec 01 2014
%K nonn,easy
%O 5,1
%A _R. K. Guy_, Oct 19 2003