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%I #9 Mar 03 2024 11:07:04
%S 2,2,3,5,10,19,36,67,125,233,435,812,1516,2830,5283,9862,18410,34367,
%T 64155,119762,223567,417346,779085,1454365,2714951,5068163,9461046,
%U 17661506,32969800,61546717,114892974,214477654,400378391
%N a(n)=Sum{a(k): k=0,1,2,...,n-4,n-2,n-1}; a(n-3) is not a summand; 3 initial terms required.
%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (2, 0, -1, 1).
%F a(n)=2*a(n-1)-a(n-3)+a(n-4); 4 initial terms required.
%t LinearRecurrence[{2,0,-1,1},{2,2,3,5},40] (* _Harvey P. Dale_, May 08 2017 *)
%K nonn
%O 0,1
%A _Clark Kimberling_
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