High-Temperature series for the $RP^{n-1}$ lattice spin model   (generalized Maier-Saupe model of nematic liquid crystals) in two space   dimensions and with general spin dimensionality n
  High temperature series expansions of the spin-spin correlation functions of the RP^{n-1} spin model on the square lattice are computed through order beta^{8} for general spin dimensionality n. Tables are reported for the expansion coefficients of the energy per site, the susceptibility and the second correlation moment. 
P. Butera and M. Comi