class_docstr: Stirling numbers of the second kind
      
class_docstr_tok: ["Stirling","numbers","of","the","second","kind"]
code: def __init__(self):
      self._cache = {}
  
file_path: statsmodels/statsmodels/distributions/copula/_special.py
imports: import numpy
  from scipy.special import factorial
label_desc: Use image node_id 1 to create a new Sterling2 object  with example: obj = Sterling2()