694599domain: NAppears in sequencesNumber T(n,k) of permutations p of [n] such that the up-down signature of 0,p has nonnegative partial sums with a maximal value of k; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=57A258829Column 2 of triangle A258829.at n=8A259213