A047185 Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= (n-2)/2.

0, 0, 0, 1, 4, 8, 20, 30, 63, 86, 182, 245, 560, 756, 1784, 2387, 5600, 7400, 17336, 22737, 53850, 70390, 168610, 219791, 529529, 688051, 1662907, 2154347, 5225636, 6754580, 16451036, 21225758, 51878873, 66826712