Looks a bit like Ford circles over Farey fractions
fordCircles[n_]:=Map[{{#,1/(2 Denominator[#]^2)},1/(2 Denominator[#]^2)}&,FareySequence[n]]
fordCirclesGraph[n_]:=Graphics[
Map[Circle@@fordCircles[n][[#]]&,Range@Length@fordCircles[n]],
PlotRange->{{0,1},{Automatic,0.5}}
]