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The Map Folding problem

The Map Folding Problem refers to the question of how many ways there are to fold a rectangular map along its (valley and peak) creases. (It's a companion of the Stamp Folding Problem, first described in 1891.)

For example : There are eight ways to fold a 2 ร— 2 map along its creases, counting each different vertical sequence of folded squares as a distinct way of folding the map.

However :

[โ€ฆ[ the general problem of counting the number of ways to fold a map remains unsolved. The numbers of ways of folding an n ร— n map are known only for n โ‰ค 7

Source : Wikipedia

Further technical information : Math. Comp. 22 (1968), 193-199


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