49700

Appears in sequences

• McKay-Thompson series of class 8E for the Monster group.at n=41A029841
• McKay-Thompson series of class 16b for the Monster group.at n=41A112151
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 7 and 9.at n=30A136907
• 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=56A137560
• Triangle by rows, related to the numbers of binary trees of height less than n, derived from the Mandelbrot set.at n=44A202019
• Number of standard Young tableaux with n cells and 4 as last value in the first row.at n=11A245002
• E.g.f. S(x) satisfies: C(x)^2 - S(x)^2 = 1 and D(x)^3 - S(x)^3 = 1, where functions C(x) and D(x) are described by A280621 and A280622, respectively.at n=9A280620
• Number of binary search trees (BST) on n nodes which have the same height as the optimal BST.at n=18A328349
• 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=34A335920