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%I
%S 0,0,0,0,0,1,6,12,42,63,168,224,504,630,1270,1527,2937,3465,6930,8184,
%T 18304,21879,54054,65065,165285,198363,491128,584464,1387744,1636284,
%U 3757884,4398954,9980054
%N Number of nonempty subsets of {1,2,...,n} in which exactly 1/6 of the elements are <= (n-4)/2.
%K nonn
%O 1,7
%A _Clark Kimberling_
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