398942612640domain: NAppears in sequencesNumber of permutations p() of 1..n+7 with centered difference p(i+1)-p(i-1) < 0 exactly 6 times.at n=7A180884Number of permutations p() of 1..n+8 with centered difference p(i+1)-p(i-1) < 0 exactly 7 times.at n=6A180885