[Winenose]

Interesting...

There's 256 pieces, which can be arranged in 256 factorial ways. That's a huge number - my windows calculator shows it's 8.6x10^506.

It's actually a bit smaller because the corner and edge pieces can only be placed certain way.

But then again, all pieces can be rotated.

I think the formula for 256 pieces that can be rotated 4 ways that do NOT have borders and corners is 4^256 x 256! = 10^661 or so.

That number of combinations is, of course, impossible to compute.