In math class, a student has written down a sequence of 16
numbers on the blackboard. Below each number, a second student
writes down how many times that number occurs in the
sequence. This results in the second sequence of 16
numbers. Below each number of the second sequence, a third student
writes down how many times that number occurs in the second
sequence. This results in the third sequence of numbers. In the
same way, a fourth, fifth, sixth, and...