%I
%S 0,0,0,0,1,5,15,30,70,141,213,405,765,1110,2310,4954,7435,16575,35945,
%T 52871,113815,240385,346745,744345,1595433,2299998,5036862,10959446,
%U 15770601,34636245,75326163,107787262,236331302,514828047
%N Number of nonempty subsets of {1,2,...,n} in which exactly 1/5 of the elements are <= (n2)/3.
%K nonn
%O 1,6
%A _Clark Kimberling_
