3065996domain: NAppears in sequencesNumber of permutations P of {1,2,...,n} such that P(1)=1 and |P^-1(i+1)-P^-1(i)| equals 1 or 2 for i=1,2,...,n-1.at n=38A038718Position of 1/n in the ordering of the rationals given by application of the map t -> (1+t,-1/t), cf. A226130.at n=12A226274