A048046 Number of nonempty subsets of {1,2,...,n} in which exactly 4/5 of the elements are <= (n+1)/3.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 8, 9, 45, 50, 55, 165, 180, 195, 455, 490, 525, 1155, 1240, 1326, 3366, 3645, 3933, 11685, 12750, 13860, 41580, 45375, 49335, 138391, 150524, 163175, 433875, 470665, 509067, 1347255, 1461278, 1580761