%I #5 Mar 30 2012 18:56:53
%S 0,0,0,0,1,4,12,30,60,121,205,385,630,1260,2156,4711,8260,18340,31620,
%T 68772,115995,250185,418825,914485,1535391,3405402,5728086,12788516,
%U 21448791,47902764,80006668,178864378,298009048,668688388
%N Number of nonempty subsets of {1,2,...,n} in which exactly 2/5 of the elements are <= (n-1)/2.
%K nonn
%O 1,6
%A _Clark Kimberling_