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Number of nonempty subsets of {1,2,...,n} in which exactly 3/4 of the elements are <= n/3.
0

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

%S 0,0,0,0,0,0,0,0,6,7,8,32,36,40,100,110,120,306,338,371,1127,1260,

%T 1400,4256,4760,5292,15180,16929,18780,53700,59920,66550,195052,

%U 218086,242792,716210,801350,892970,2618486,2929563,3265171

%N Number of nonempty subsets of {1,2,...,n} in which exactly 3/4 of the elements are <= n/3.

%K nonn

%O 1,9

%A _Clark Kimberling_