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%I #4 Mar 30 2012 18:56:54
%S 0,0,0,0,0,0,0,0,7,8,9,27,30,33,121,138,156,520,595,675,2255,2600,
%T 2975,9877,11445,13167,43510,50625,58513,192801,225093,261165,858199,
%U 1004754,1169505,3834655,4500210,5252445,17189667,20214327
%N Number of nonempty subsets of {1,2,...,n} in which exactly 2/3 of the elements are <= (n-3)/3.
%K nonn
%O 1,9
%A _Clark Kimberling_
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