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%I
%S 0,1,3,4,7,12,23,43,81,151,282,526,982,1833,3422,6388,11925,22261,
%T 41556,77575,144814,270333,504647,942055,1758591,3282868,6128328,
%U 11440120,21355963,39866466,74421140,138926437,259342371,484130068
%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 0,3
%A _Clark Kimberling_
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