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

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

%S 0,0,0,0,0,0,2,3,18,63,84,224,504,630,1270,2420,2937,5742,12012,15015,

%T 35035,84119,108164,260064,601664,767244,1720944,3755844,4738410,

%U 10329750,22591800,28583709,64071194,144780009,184657869

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

%K nonn

%O 1,7

%A _Clark Kimberling_