# Python | sympy.subfactorial() method

With the help of sympy.subfactorial() method, we can find the Subfactorial of a number in SymPy. Subfactorial of a number is given by – Syntax: subfactorial(n)

Parameter:
n – It denotes the number whose subfactorial is to be calculated.

Returns: Returns the subfactorial of number, i. e., n.

Example #1:

 # import sympy   from sympy import *     n = 4 print("Value of n = {}".format(n))      # Use sympy.subfactorial() method   subfactorial_n = subfactorial(n)           print("Subfactorial of n : {}".format(subfactorial_n))

Output:

Value of n = 4
Subfactorial of n : 9


Example #2:

 # import sympy   from sympy import *     n = 9 print("Value of n = {}".format(n))      # Use sympy.subfactorial() method   subfactorial_n = subfactorial(n)           print("Subfactorial of n : {}".format(subfactorial_n))

Output:

Value of n = 9
Subfactorial of n : 133496


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