def _cis_term(self, base_ring):
"""
EXAMPLES::
sage: F = species.CharacteristicSpecies(2)
sage: g = F.cycle_index_series()
sage: g.coefficients(5)
[0, 0, 1/2*p[1, 1] + 1/2*p[2], 0, 0]
"""
cis = SetSpecies(weight=self._weight).cycle_index_series(base_ring)
return cis.coefficient(self._n)
