2: 0.500691360286 3: 0.643353043366 4: 0.683921596576 7: 0.773401521605 19: 0.797778382713 37: 0.806994224018 2 3 4 7 19 37 Fit of radii by a power law r = a0*n^a1: a0 = 0.75214 a1 = -0.45680