32369568domain: NAppears in sequencesNumber of permutations p() of 1..n+4 with centered difference p(i+1)-p(i-1) < 0 exactly 3 times.at n=7A180881Number of permutations p() of 1..n+8 with centered difference p(i+1)-p(i-1) < 0 exactly 7 times.at n=3A180885