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%I #4 Mar 30 2012 18:56:54
%S 0,0,0,1,2,8,20,30,63,126,182,392,844,1270,2800,5995,9020,19595,41951,
%T 63518,138866,299411,455966,997640,2154104,3290520,7201692,15584085,
%U 23878212,52311408,113406028,174179258,381766253,828748052
%N Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= (n+1)/3.
%K nonn
%O 1,5
%A _Clark Kimberling_
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