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Comment by kevindamm

5 days ago

There are about 490 million of them, the full list can be downloaded from that same cube20 site

https://www.cube20.org/distance20s

You can trim it down by counting in quarter moves.

That is, count a 180° move as two 90° moves. Which it is, though we usually don't think of it that way.

Assuming a random move length distribution, that would only leave a (2/3)^20 fraction of them, which is about 147000 positions.