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%I #4 Mar 30 2012 18:56:54
%S 0,0,0,1,4,10,20,41,77,126,252,505,844,1780,3652,5995,12545,25805,
%T 41951,88634,184736,299411,636524,1334942,2154104,4594244,9685364,
%U 15584085,33355944,70639794,113406028,243374923,517215283,828748052
%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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