2: 0.505009863813
    3: 0.602280894881
    4: 0.664872028015
    5: 0.765695954932
   15: 0.774934987330
   16: 0.777598749710
   26: 0.780022883175
   27: 0.782884729566
   29: 0.787216154549
   30: 0.795890460898
   42: 0.797115765780
   44: 0.799351771065
   46: 0.799428585597
   47: 0.803231865120
   48: 0.809806426252

2 3 4 5 15 16 26 27 29 30 42 44 46 47 48

Fit of radii by a power law r = a0*n^a1:
  a0 = 0.66414  a1 = -0.45630