A048000 Number of nonempty subsets of {1,2,...,n} in which exactly 4/5 of the elements are <= n/3.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 9, 10, 50, 55, 60, 180, 195, 210, 490, 525, 560, 1240, 1326, 1413, 3645, 3933, 4230, 12750, 13860, 15015, 45375, 49335, 53460, 150524, 163175, 176345, 470665, 509067, 549094, 1461278, 1580761