def Fibonacci(n): \n    a = 0\n    b = 1\n    if n < 0: \n        print("Incorrect input")  \n    elif n == 0: \n        return a \n    elif n == 1: \n        return b \n    else: \n        for i in range(2,n): \n            c = a + b \n            a = b \n            b = c\n            print(c)\n        return b \n  \n# Driver Program \n  \nprint(Fibonacci(20))
Design a program to calculate the Fibonacci sequence up to 20 numbers.?