30782

Appears in sequences

• Integers i such that 9*i = 25 X i, but 17*i is not 49 X i.at n=31A115811
• 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=61A137560
• Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, -1), (0, 1), (1, 0), (1, 1)}.at n=8A151315
• Triangle by rows, related to the numbers of binary trees of height less than n, derived from the Mandelbrot set.at n=39A202019
• Number of (n+1)X(2+1) 0..1 arrays with each row nonprime and column prime, read as a binary number with top and left being the most significant bits.at n=12A261937
• Number of (binary) max-heaps on n elements from the set {0,1} containing exactly eight 0's.at n=23A326509
• Number of binary search trees (BST) on n nodes which have the same height as the optimal BST.at n=23A328349
• 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=39A335920