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

%I #4 Mar 30 2012 18:56:54

%S 0,0,0,0,0,0,0,0,0,0,0,0,0,9,10,11,66,72,78,273,294,315,840,896,952,

%T 2142,2268,2394,4959,5230,5502,12012,12705,13409,34914,37224,39600,

%U 117975,126412,135135,405405,434434,464464,1309959,1400455

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

%K nonn

%O 1,14

%A _Clark Kimberling_