Well if you consider looking up a calculation, than a phone book does a calculation for you.
No, because a phone book doesn't actually look anything up, RAM does.
Yet, unless someone allready knows which person has which phonenumber there is no such book.
By that logic, CPUs don't calculate because they don't know how to do anything until they're instructed to do things.
If you want to make a big table for all possible future blocks. Be my guest.
That's the problem. The limited calculation that RAM can do is only useful for real-world crypto problems with amounts of RAM that wouldn't fit in any known universe. (Perhaps unknown ones are larger?)