A048031 Number of nonempty subsets of {1,2,...,n} in which exactly 3/4 of the elements are <= (n-3)/3.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 10, 11, 44, 48, 52, 130, 140, 150, 405, 440, 476, 1547, 1701, 1862, 5852, 6440, 7056, 20734, 22792, 24955, 73600, 81080, 89000, 269225, 297440, 327492, 991314, 1096627, 1209155, 3626363, 4014205