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%I #3 Mar 30 2012 18:56:03
%S 0,2,1,0,2,1,4,6,10,24,36,85,152,310,638,1232,2620,5194,10840,22332,
%T 46004,96528,199816,420365,880112,1851366,3908854,8245536,17482220,
%U 37049662,78746776,167602164,357127116,762506640,1629288824,3487128706,7470956240
%N a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-3)*a(3) for n >= 4.
%K nonn
%O 1,2
%A _Clark Kimberling_
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