  A procedure to derive the partition function of non-interacting particles
with exotic or intermediate statistics is presented. The partition function is
directly related to the associated creation and annihilation operators that
obey some specific commutation or anti-commutation relations. The cases of
Gentile statistics, quons, Polychronakos statistics, and ewkons are considered.
Ewkons statistics was recently derived from the assumption of free diffusion in
energy space (Phys. Rev. E 94, 062115, 2016); an ideal gas of ewkons has
negative pressure, a feature that makes them suitable for the description of
dark energy.
