Write a class called fibs that generates numbers in the Fibonacci sequence (each number is the sum of the previous two). The sequence starts 1, 1, 2, 3, 5, ...
Have the main() function take an integer command line argument from 2 through 20 indicating the number of values in the sequence to print. Each value should be printed on a separate line. Verify that the provided argument is between 2 and 20, inclusive.