def _compute_n_j_minus_one_term(one_over_delta_grid,
    one_over_delta_grid_bar_backward, C_backward, B_backward, delta_j_minus_one
    ):
    """
    equation for the CC n_j-1 term

    :param one_over_delta_grid: the total change in energy
    :param one_over_delta_grid_bar_forward: the forward change in energy for the second derivative
    :param C_backward: the backward dispersion term
    :param B_backward: the backward heating term
    :param one_minus_delta_j: 1 - delta_j
    """
    return one_over_delta_grid * (one_over_delta_grid_bar_backward *
        C_backward - delta_j_minus_one * B_backward)
