Most Beautiful Equation Ever

factorial.py

import math, tabulate

def factorial(x):
	pi = math.pi
	e  = math.exp(1)
	exponent = -x + pi ** e / (e ** (2 * pi) * x) + \
		pi ** e / (e ** (2 * pi) * x + 2 * pi ** e)
	return x ** x * math.sqrt(2 * pi * x) * math.exp(exponent)

if __name__ == '__main__':
	table = []
	for i in range(1,10):
		table.append((i, factorial(i), math.factorial(i)))
	
	print tabulate.tabulate(table, 
		headers = ("x","factorial(x)","math.factorial(x)"),
		tablefmt= "fancy_grid")