%I #5 Mar 30 2012 18:56:59
%S 0,2,3,5,8,15,28,53,99,185,345,644,1202,2244,4189,7820,14598,27251,
%T 50871,94964,177275,330930,617767,1153223,2152791,4018745,7502034,
%U 14004500,26143046,48802803,91103140,170067734,317475711
%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.
%F a(n)=2*a(n-1)-a(n-3)+a(n-4); 4 initial terms required.
%K nonn
%O 0,2
%A _Clark Kimberling_
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