Python newbie trying to recursively generate a pattern of numbers

I need to write a function that generates these patterns:

>>> pattern(1)
1
>>> pattern(2)
 1
121
 1
>>> pattern(3)
  1
 121
  1
12321
  1
 121
  1

This is what I have tried:

def pattern(n):
    if n>=1:
        pattern(n-1)
        print(n,end='')
        pattern(n-1)

and then I tried to iterate over it using:

>>>for i in range(3):
        pattern(i)
        print()

1
121

Can anyone help me understand this concept?