I want to see more!

I will walk from A to B moving only North and East along the grid lines. Then, I will walk back to A along the gridlines, visiting only locations that I have not visited before.

How many paths are there from A to B that allow me to walk back to A in this way?


The green path on the left allows me to walk back to A visiting only new locations, but the orange path on the right does not.

The green path on the left allows me to walk back to A visiting only new locations, but the orange path on the right does not.

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