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%I #12 Jun 10 2019 00:25:07
%S 0,0,0,0,0,5,6,27,35,119,164,494,714,2001,3002,8007,12375,31823,50387,
%T 125969,203489,497419,817189,1961255,3268759,7726159,13037894,
%U 30421754,51895934,119759849,206253074,471435599,818809199
%N Number of nonempty subsets of {1,2,...,n} in which exactly 1/2 of the elements are <= (n-4)/2.
%H Robert Israel, <a href="/A048060/b048060.txt">Table of n, a(n) for n = 1..3324</a>
%F a(n) = binomial(n, ceiling(n/2)+2) - 1 for n >= 4. - _Robert Israel_, Jul 11 2018
%p 0,0,0,seq(binomial(n,ceil(n/2)+2)-1, n=4..40); # _Robert Israel_, Jul 11 2018
%K nonn
%O 1,6
%A _Clark Kimberling_
%E Corrected by _Franklin T. Adams-Watters_, Oct 25 2006
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