There are 7*7 squares: 2*2,

There are 6*6 squares: 3*3,

5*5 squares are: 4*4,

A square with 4*4: 5*5,

There are 3*3 squares: 6*6,

2*2 squares are: 7*7,

The squares of 1* 1 are: 8*8,

There is always * * *:

1*1+2 * 2+3 * 3+4 * 4+5 * 5+6 * 6+7 * 7+8 * 8 = 204 (piece)