Why do the middle rows of my hollow right triangle all have the same size?

Question

I have a task to create a hollow right triangle using a function. The question I have is how to print in numerical order.

So, starting with one in row one and ending in the last row with four characters. The code I have right now created the first and last rows. For the middle row I need it to have it in order but missing the middle if its greater than 2. I have a function that works and does this (hollow_row) but right now my code is just printing the given number without going from smallest to largest.

How can I fix this?

def triangle(char,n):
    middle_row = hollow_row(char,n)
    print(char*1)
    for i in range (n-2):
         print(middle_row)
    print(char*n)

What it prints:

#
#  #
#  #
####

What it needs to print:

#
##
# #
####