520105017600domain: NAppears in sequencesa(n) = 2*(A056855(n)) /(phi(n)*n), where phi() is the Euler phi function.at n=16A099940a(n) is the number of permutations p of {1,..,n} such that the minimum number of block interchanges required to sort the permutation p to the identity permutation is maximized.at n=15A260695