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Number of nonempty subsets of {1,2,...,n} in which exactly 5/6 of the elements are <= n/3.
0

%I #5 Mar 30 2012 18:56:54

%S 0,0,0,0,0,0,0,0,0,0,0,0,0,0,10,11,12,72,78,84,294,315,336,896,952,

%T 1008,2268,2394,2520,5230,5502,5775,12705,13409,14124,37224,39600,

%U 42042,126412,135135,144144,434434,464464,495495,1400455

%N Number of nonempty subsets of {1,2,...,n} in which exactly 5/6 of the elements are <= n/3.

%K nonn

%O 1,15

%A _Clark Kimberling_