54746

Appears in sequences

• Let f(z) = z^2 + c, then row k lists the expansion of the n-fold composition f(f(...f(0)...)) in rising powers of c.at n=57A137560
• Triangle by rows, related to the numbers of binary trees of height less than n, derived from the Mandelbrot set.at n=43A202019
• Numbers k such that there is no prime p and index j < k such that A002182(k) = p * A002182(j).at n=20A272606
• Number of permutations on [n] whose up-down signature has nonnegative partial sums and which have exactly three descents.at n=8A321269
• 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=24A321280
• Number of binary search trees (BST) on n nodes which have the same height as the optimal BST.at n=19A328349
• Number T(n,k) of binary search trees of height k having n internal nodes; triangle T(n,k), k>=0, k<=n<=2^k-1, read by columns.at n=35A335920