project

[amgaieth]

Let An be the set of all decimal (base 10) positive n-digits integers, 1≤ n ≤ 20,
having the following properties:
 The numbers of An consist only of 0s and 1s.
 The numbers of An do not contain two adjacent 0s.
 The numbers of An do not contain three adjacent 1s.
Example: n = 5, A5 = {10101, 10110, 11010, 11011}
Write a program that solves the following programming problem for a given value
of n.
Problem. Generate and display all numbers of An. Input data: n, 1≤ n ≤ 20.



Above is a project I need to work on.
I have no idea where to start.
Any ideas??
Appreciate it.