def METHOD_NAME(self, base_ring, n):
    r"""
    The generating series for the species of linear orders is
    `\frac{1}{1-x}`.
    EXAMPLES::
        sage: L = species.LinearOrderSpecies()
        sage: g = L.generating_series()
        sage: g[0:10]
        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
    """
    return base_ring.one()