Consider a positive integer $n$ and $A = \{ 1,2,...,n \}$. Call a subset $X \subseteq A$ [i][b]perfect[/b][/i] if $|X| \in X$. Call a perfect subset $X$ [i][b]minimal[/b][/i] if it doesn't contain another perfect subset. Find the number of minimal subsets of $A$.
1. **Define the problem and the set \( A \):**
   Let \( A = \{1, 2, \ldots, n\} \). We need to find the number of minimal perfect subsets of \( A \).

2. **Define a perfect subset:**
   A subset \( X \subseteq A \) is called perfect if \( |X| \in X \). This means the size of the subset \( X \) is an element of \( X \).

3. **Define a minimal perfect subset:**
   A perfect subset \( X \) is minimal if it does not contain another perfect subset. This means there is no subset \( Y \subset X \) such that \( Y \) is also perfect.

4. **Characterize minimal perfect subsets:**
   Let \( E \) be a minimal perfect subset. Let \( m(E) = \min_{x \in E} x \). For \( E \) to be minimal and perfect, we must have:
   \[
   m(E) = |E|
   \]
   and for all \( x \in E \), \( x \ge m(E) \).

5. **Derive constraints on \( m(E) \):**
   Since \( m(E) = |E| \), and \( x \ge m(E) \) for all \( x \in E \), the elements of \( E \) are \( m(E), m(E)+1, \ldots, m(E) + |E| - 1 \). Therefore, the largest element in \( E \) is \( m(E) + |E| - 1 \le n \). This gives:
   \[
   m(E) + m(E) - 1 \le n \implies 2m(E) - 1 \le n \implies m(E) \le \left\lfloor \frac{n+1}{2} \right\rfloor
   \]

6. **Count the number of minimal perfect subsets:**
   For each \( p \le \left\lfloor \frac{n+1}{2} \right\rfloor \), the number of minimal perfect subsets of cardinality \( p \) is given by choosing \( p-1 \) elements from the \( n-p \) elements greater than \( p \). This is:
   \[
   \binom{n-p}{p-1}
   \]

7. **Sum over all possible values of \( p \):**
   The total number of minimal perfect subsets is:
   \[
   \sum_{k=1}^{\left\lfloor \frac{n+1}{2} \right\rfloor} \binom{n-k}{k-1}
   \]

The final answer is \(\boxed{\sum_{k=1}^{\left\lfloor \frac{n+1}{2} \right\rfloor} \binom{n-k}{k-1}}\).