  We calculate the equation of state of a two-component Fermi gas with
attractive short-range interspecies interactions using the fixed-node diffusion
Monte Carlo method. The interaction strength is varied over a wide range by
tuning the value $a$ of the s-wave scattering length of the two-body potential.
For $a>0$ and $a$ smaller than the inverse Fermi wavevector our results show a
molecular regime with repulsive interactions well described by the dimer-dimer
scattering length $a_m=0.6 a$. The pair correlation functions of parallel and
opposite spins are also discussed as a function of the interaction strength.
