Square Fractal on a Line (Source Code)

Draw the following fractal made up with squares with recursion and Turtle library.

Source Code:

import turtle
screen = turtle.Screen()
screen.title('Squares In a Row - PythonTurtle.Academy')
screen.setworldcoordinates(-1000,-1000,1000,1000)
screen.tracer(0,0)
turtle.speed(0)
turtle.hideturtle()
turtle.color('purple')

def squaresinarow(x,y,length,n):
    if n==0: return       
    turtle.up()
    turtle.goto(x-length/2,y-length/2)
    turtle.down()
    turtle.seth(0)
    for _ in range(4):
        turtle.fd(length)
        turtle.left(90)

    squaresinarow(x+3*length/4,y-length/4,length/2,n-1)
    squaresinarow(x-3*length/4,y-length/4,length/2,n-1)
    
squaresinarow(0,0,600,6)
screen.update()