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%I #3 Mar 30 2012 18:55:59
%S 1,2,4,9,20,44,97,230,540,1257,2920,7128,17225,41276,98848,244857,
%T 602368,1472564,3594009,9001188,22402820,55447385,137104808,345794100,
%U 868000657,2169191678,5413976096,13735048385,34694002916,87290093640,219428919825
%N s(n+3)/2, where s is A024735.
%K nonn
%O 1,2
%A _Clark Kimberling_