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# scipy.special.factorialk

`scipy.special.``factorialk`(n, k, exact=True)

  n(!!...!) = multifactorial of order k k times

  Parameters: | n : int Calculate multifactorial. If n < 0, the return value is 0. k : int Order of multifactorial. exact : bool, optional If exact is set to True, calculate the answer exactly using integer arithmetic.
  Returns: | val : int Multi factorial of n.
  Raises: | NotImplementedError Raises when exact is False

  Examples

      >>> from scipy.special import factorialk
      >>> factorialk(5, 1, exact=True)
      120L
      >>> factorialk(5, 3, exact=True)
      10L