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%I #4 Mar 30 2012 18:56:54
%S 0,0,0,0,4,10,20,41,77,140,252,505,1000,1780,3652,7305,12545,25805,
%T 52325,88634,184736,379676,636524,1334942,2764139,4594244,9685364,
%U 20191604,33355944,70639794,148064400,243374923,517215283
%N Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= (n-2)/3.
%K nonn
%O 1,5
%A _Clark Kimberling_