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%I #7 Jul 21 2019 07:45:32
%S 1,1,6,6,6,6,42,78,114,366,870,1806,4470,10374,26682,63510,151962,
%T 375414,936294,2295078,5570214,13729974,35174202,87526302,215709522,
%U 540037374,1388390982,3485855310,8700035046,21930804870,56696874954,143383060518
%N a(n) = Sum_{i=1..floor((n+1)/4)} a(2*i-1) * a(n-2*i+1), with a(1)=a(2)=1 and a(3)=6.
%K nonn
%O 1,3
%A _Clark Kimberling_
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