Create a function xMasTree(height) that returns a christmas tree of the correct height. The height is passed through to the function and the function should return a list containing each line of the tree. 
```
xMasTree(5) should return : ['____#____', '___###___', '__#####__', '_#######_', '#########', '____#____', '____#____']
xMasTree(3) should return : ['__#__', '_###_', '#####', '__#__', '__#__']
```
The final idea is for the tree to look like this if you decide to print each element of the list: 
``` 
xMasTree(5) will result in:
____#____              1
___###___              2
__#####__              3
_#######_              4
#########       -----> 5 - Height of Tree
____#____        1      
____#____        2 - Trunk/Stem of Tree
xMasTree(3) will result in:
__#__                  1
_###_                  2
#####          ----->  3 - Height of Tree
__#__           1
__#__           2 - Trunk/Stem of Tree
```
Pad with underscores i.e _ so each line is the same length. The last line forming the tree having only hashtags, no spaces. Also remember the trunk/stem of the tree.
def xMasTree(n):
    n2 = n * 2 - 1
    return [('#' * i).center(n2, '_') for i in range(1, n2 + 1, 2)] + ['#'.center(n2, '_')] * 2
def xMasTree(n):
    n2 = n * 2 - 1
    return [('#' * i).center(n2, '_') for i in range(1, n2 + 1, 2)] + ['#'.center(n2, '_')] * 2