input: 
  def sierpinski_triangle(n): 
      """ Generate the first n elements of the Sierpinski triangle.
      >>> sierpinski_triangle(6)
        1  
       0 1 
      0 1 1 
     0 1 0 1 
    0 1 1 1 1 
   0 1 0 1 0 1 
      """
      for i in range(2**n): 
          print(' ', end=" ") 
      
      for i in range(1, n+1): 
          for j in range(2**(i-1), 2**i): 
              print('1', end=" ") 
          print() 
          
          if i > 1: 
              for j in range(2**(i-1)+1, 2**i-1):  
                  print('0', end=" ") 
              print() 
  
output:     result = []
      for i in range(n):
          row = []
          for j in range(i + 1):
              if j == 0 or j == i:
                  row.append(1)
              else:
                  row.append(result[i - 1][j - 1] ^ result[i - 1][j])
          result.append(row)
      
      max_width = len(str(result[-1][len(result[-1]) // 2]))
      for row in result:
          formatted_row = ' '.join(str(num).rjust(max_width) for num in row)
          print(formatted_row.center(max_width * n))