40298572

Appears in sequences

• Number of permutations on [n] whose up-down signature has nonnegative partial sums and which have exactly three descents.at n=12A321269
• Number T(n,k) of permutations p of [n] with exactly k descents such that the up-down signature of p has nonnegative partial sums; triangle T(n,k), n>=0, 0<=k<=max(0,floor((n-1)/2)), read by rows.at n=46A321280