%I #7 Jul 21 2019 07:45:05
%S 1,1,5,5,5,5,30,55,80,230,530,1080,2505,5555,13755,31330,71405,168605,
%T 403830,947180,2199905,5189130,12724755,30313630,71503880,171244630,
%U 421182405,1012930055,2420011955,5834077855,14434795655,34963583830
%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)=5.
%K nonn
%O 1,3
%A _Clark Kimberling_
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