$m$ $\delta = 2$ $\delta = 3$ $\delta = 4$ $\delta = 5$ $\delta = 6$ $\delta = 7$ 22 18 0 0 0 0 0 23 0 0 0 0 0 0 24 1136 648 0 0 0 0 25 0 180 - - - - 26 37206 74122 - - - - 27 450 33450 - - - - 28 843768 4793856 - - - - 29 36564 3234276 - - - - 30 14953112 233327360 - - - -