[milkshakes]

doesn't that assume you can only select each pad once?

[jaredmcateer]

Yea and you can only select an adjacent spot so that also limits combinations.

[woqe]

You can actually select spots not adjacent to the current one.

Consider the "spots" labeled in rows from left to right as 1 2 3, 4 5 6, and 7 8 9.

If I start at 1, I can go to 2, 4, 5, 6, and 8 directly. Also, if I have used all spots except 1 and 9, I can go to 1 then directly to 9.

[ZoF]

Yep, and the fact that the above calculation doesn't even allow for combinations greater than four... Overall not a reliable number :)

[hfsktr]

My Galaxy S4 seems to only allow one direction for each node.

[ZoF]

You can in fact only select each pad once.