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%I
%S 1,1,2,2,4,6,10,15,25,40,65,103,168,271,439,708,1147,1855,3002,4853,
%T 7855,12708,20563,33265,53828,87093,140921,228004,368925,596929,
%U 965854,1562768,2528622,4091390,6620012,10711377,17331389
%N a(n)=a(n-1)+a(n-2)-d, where d=a(n/4) if 4 divides n, else d=0; 2 initial terms.
%K nonn
%O 1,3
%A _Clark Kimberling_
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