calculating u mentioned in the formula
def ucal ( u , n ) : NEW_LINE INDENT if ( n == 0 ) : NEW_LINE INDENT return 1 ; NEW_LINE DEDENT temp = u ; NEW_LINE for i in range ( 1 , int ( n / 2 + 1 ) ) : NEW_LINE INDENT temp = temp * ( u - i ) ; NEW_LINE DEDENT for i in range ( 1 , int ( n / 2 ) ) : NEW_LINE INDENT temp = temp * ( u + i ) ; NEW_LINE DEDENT return temp ; NEW_LINE DEDENT