def METHOD_NAME(self):
    n = (2*self.expt / np.pi)**(3./4.)
    n *= np.sqrt(2.**(self.l) / factorial2(2*self.i - 1) / factorial2(2*self.j - 1) / factorial2(2*self.k - 1)) * np.sqrt(2*self.expt)**self.l
    return n