valid_input = False

while not valid_input:
    x = input("Enter a number between 1 and 19: ")
    x = int(x)

    if x >= 1 and x <= 19:
        valid_input = True

for row in range(1, x + 1):
    for product in range(row, row * (x + 1), row):
        print(f"{product:4}", end="")
    print()