code: def li4(z):
      """Polylogarithm for negative integer order -4
  
      Li(-4, z)
      """
      return z * (1 + z) * (1 + 10 * z + z**2) / (1 - z) ** 5
  
file_path: statsmodels/statsmodels/distributions/copula/_special.py
imports: import numpy
  from scipy.special import factorial
label_desc: Use image node_id 2 for calling a global function with example usage: li4(z) and returns: unknown