%I #5 Mar 30 2012 18:56:54
%S 0,0,0,0,1,4,12,30,60,121,217,364,700,1260,2250,4960,9460,17380,38500,
%T 71071,126763,276549,503685,898380,2006508,3681588,6619596,14981556,
%U 27412041,49146654,111406614,202871284,363087604,828004144
%N Number of nonempty subsets of {1,2,...,n} in which exactly 2/5 of the elements are <= (n+2)/3.
%K nonn
%O 1,6
%A _Clark Kimberling_