3014400869domain: NAppears in sequencesNumber of permutations q_1,...,q_n of the first n primes p_1,...,p_n with q_1 = p_1 = 2 and q_n = p_n, and with |q_1-q_2|, |q_2-q_3|, ..., |q_{n-1}-q_n|, and |q_n-q_1| (if n>2) pairwise distinct.at n=16A185645