The number of ways of folding a strip of stamps has several possible variants. Considering only positions of the hinges for unlabeled stamps without regard to orientation of the stamps, the number of foldings is denoted U(n). If the stamps are labeled and orientation is taken into account, the number of foldings is denoted N(n). Finally, the number of symmetric foldings is denoted S(n). The following table summarizes these values for the first n.

map folding | postage stamp problem