A070894 Number of nonempty subsets of the set of vertices of a regular n-gon in the plane such that their center of gravity is the center of the polygon.

1, 1, 3, 1, 9, 1, 15, 7, 33, 1, 99, 1, 129, 37, 255, 1, 999, 1, 1155, 133, 2049, 1, 9999, 31, 8193, 511, 16899, 1, 146853, 1, 65535, 2053, 131073, 157, 999999, 1, 524289, 8197, 1336335, 1, 11680389, 1, 4202499, 54871, 8388609, 1, 99999999, 127, 45435423, 131077