Let $A_1=0$ and $A_2=1$.  For $n>2$, the number $A_n$ is defined by concatenating the decimal expansions of $A_{n-1}$ and $A_{n-2}$ from left to right.  For example $A_3=A_2A_1=10$, $A_4=A_3A_2=101$, $A_5=A_4A_3=10110$, and so forth.  Determine all $n$ such that $11$ divides $A_n$.
1. **Define the sequence and initial values:**
   Given \( A_1 = 0 \) and \( A_2 = 1 \). For \( n > 2 \), \( A_n \) is defined by concatenating the decimal expansions of \( A_{n-1} \) and \( A_{n-2} \) from left to right. For example:
   \[
   A_3 = A_2 A_1 = 10, \quad A_4 = A_3 A_2 = 101, \quad A_5 = A_4 A_3 = 10110
   \]

2. **Identify the problem:**
   We need to determine all \( n \) such that \( 11 \) divides \( A_n \).

3. **Analyze the sequence modulo 11:**
   Let's denote the residue of \( A_n \) modulo 11 by \( r(A_n) \). We need to find a pattern in these residues.

4. **Establish the recurrence relation for residues:**
   Since \( A_n \) is formed by concatenating \( A_{n-1} \) and \( A_{n-2} \), we need to consider the effect of concatenation on the residue modulo 11. Let \( d(A_n) \) be the number of digits in \( A_n \).

   The residue of \( A_n \) modulo 11 can be expressed as:
   \[
   r(A_n) = (r(A_{n-1}) \cdot 10^{d(A_{n-2})} + r(A_{n-2})) \mod 11
   \]

5. **Determine the number of digits:**
   The number of digits \( d(A_n) \) grows as follows:
   \[
   d(A_1) = 1, \quad d(A_2) = 1, \quad d(A_3) = 2, \quad d(A_4) = 3, \quad d(A_5) = 5, \quad \text{and so on}
   \]
   This sequence follows the Fibonacci sequence in terms of the number of digits.

6. **Simplify the recurrence relation:**
   We need to consider the effect of \( 10^{d(A_{n-2})} \mod 11 \). Since \( 10 \equiv -1 \mod 11 \), we have:
   \[
   10^{d(A_{n-2})} \equiv (-1)^{d(A_{n-2})} \mod 11
   \]

7. **Analyze the periodicity:**
   The residues \( r(A_n) \) modulo 11 will exhibit periodic behavior. We need to find the period of this sequence.

8. **Check the periodicity:**
   By examining the residues, we find that the sequence of residues modulo 11 is periodic with a period of 6. Specifically, the residues repeat every 6 terms.

9. **Identify the condition for divisibility by 11:**
   From the periodicity, we observe that \( r(A_n) \equiv 0 \mod 11 \) when \( n \equiv 1 \mod 6 \). This means \( 11 \) divides \( A_n \) when \( n = 6k + 1 \) for some integer \( k \).

Conclusion:
\[
\boxed{n = 6k + 1 \text{ for integer } k}
\]