28150

Appears in sequences

• Number of nonnegative solutions to x^2 + y^2 + z^2 <= n^2.at n=37A000604
• Self-convolution of numbers of trees on n nodes.at n=15A006706
• Consider the version of the Collatz or 3x+1 problem where x -> x/2 if x is even, x -> (3x+1)/2 if x is odd. Define the stopping time of x to be the number of steps needed to reach 1. Sequence gives the number of integers x with stopping time n.at n=37A060322
• Total number of leaves and degree-1 roots in the rooted trees of order n.at n=11A095337
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 299", based on the 5-celled von Neumann neighborhood.at n=34A271154
• a(1) = 1; for n > 1, a(n) = 4*a(A252463(n)) + (n mod 4).at n=25A292384
• Number of permutations of [n] avoiding {4231, 1423, 1234}.at n=11A294765