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A048066 Number of nonempty subsets of {1,2,...,n} in which exactly 2/5 of the elements are <= (n-4)/2. 0

%I

%S 0,0,0,0,0,0,0,20,35,105,168,364,588,1260,2250,4960,9460,20020,38500,

%T 77001,148161,286689,560469,1071525,2143051,4064071,8259196,15473436,

%U 31705476,58620692,120894085,221227279,459855214

%N Number of nonempty subsets of {1,2,...,n} in which exactly 2/5 of the elements are <= (n-4)/2.

%K nonn

%O 1,8

%A _Clark Kimberling_

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Last modified October 27 19:59 EDT 2020. Contains 338036 sequences. (Running on oeis4.)