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

%I #5 Mar 30 2012 18:56:53

%S 0,0,1,3,6,13,21,45,70,154,235,525,791,1793,2681,6153,9150,21206,

%T 31401,73359,108262,254607,374715,886171,1301235,3091971,4531423,

%U 10811671,15818791,37877401,55339849,132924649,193962894,467187454

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

%K nonn

%O 1,4

%A _Clark Kimberling_