4295032831domain: NAppears in sequencesNumber of reversible string structures with n beads using exactly two different colors.at n=33A056326a(n) = 4^n + 2^n - 1.at n=16A099393Maximal size of a Binary Decision Diagram (or BDD) of index n.at n=35A327461Primes of the form q*2^h - 1, where q is a Fermat prime.at n=27A336116