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%I #7 Jul 21 2019 19:51:32
%S 3,1,2,6,18,54,174,558,1782,5694,19170,64206,214050,712566,2465694,
%T 8480310,29012526,99157446,348577698,1219546278,4248000882,
%U 14773851366,52521676254,185880813822,655167175446,2306629089486,8261570136834,29484704469390
%N a(n) = Sum_{i=1..floor((n+1)/4)} a(2*i-1) * a(n-2*i+1), with a(1)=3, a(2)=1, and a(3)=2.
%K nonn
%O 1,1
%A _Clark Kimberling_
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