How many squares?

[NLBlacky]

There is 1 square with size 4x4
There are 3 squares with size 3x3
There are 9 squares with size 2x2
There are 16 squares with size 1x1

Smaller squares in the top and bottom middle:
There are 2 bigger squares
There are 8 smaller squares

The total amount of squares is 39?

 

[GolamT313]

40[DOUBLEPOST=1560034803][/DOUBLEPOST]

There is 1 square with size 4x4
There are 3 squares with size 3x3
There are 9 squares with size 2x2
There are 16 squares with size 1x1

Smaller squares in the top and bottom middle:
There are 2 bigger squares
There are 8 smaller squares

The total amount of squares is 39?

There are 4 squares that are 3x3

 

[NLBlacky]

40[DOUBLEPOST=1560034803][/DOUBLEPOST]
There are 4 squares that are 3x3

Whoops I misspelled that and took it in my calculations facepalm
Answer is 40

 

[fwai]

69​

 

[Ally]

It's definitely 40. The general case equation for problems like these is here:
https://sevr.org/i/4dd28f09-89ff-4d4b-adda-a5e31c1d3e80.png

Therefore the equation for this is:

If you don't like summations, Faulhaber's formula can turn it into:

This was fun bye.

There is 1 square with size 4x4
There are 3 squares with size 3x3
There are 9 squares with size 2x2
There are 16 squares with size 1x1

Smaller squares in the top and bottom middle:
There are 2 bigger squares
There are 8 smaller squares

The total amount of squares is 39?

You were the closest with your explanation. (You missed 1 3x3 square so 40 squares). Nice work.