I feel stupid, but I don't know how to calculate how many possible variations I can get from for example three spaces (1|2|3) Normally I'd say: "well that is easy, just take the number of spaces (=3) and 3^3"
But that doesn't work with two spaces, like "1|2", there are only 2 different ways on how to arrange two numbers, but 2^2 would be 4.
(I want to know how many spaces I need to get ~25000 possible variations)