Orbitwise countings in H(2) and quasimodular forms
  We prove formulae for the countings by orbit of square-tiled surfaces of genus two with one singularity. These formulae were conjectured by Hubert & Leli\`{e}vre. We show that these countings admit quasimodular forms as generating functions. 
Samuel Leli\`evre (I3M, IML), Emmanuel Royer (I3M)