# this file available at: https://arachnoid.com/files/python01/

# function definition
def mult_table(n : int = 12) -> None:
    # create rows
    for y in range(n):
        # create columns
        for x in range(n):
            # print product of x+1 and y+1
            print(f'{(x+1)*(y+1):4d}',end='')
        # print linefeed
        print()

def main():
    mult_table(20)

if __name__ == "__main__":
    main()