We draw $n$ convex quadrilaterals in the plane. They divide the plane into regions (one of the regions is infinite). Determine the maximal possible number of these regions.
1. **Initial Observation**: We need to determine the maximal possible number of regions created by drawing \( n \) convex quadrilaterals in the plane. One of these regions will be infinite.

2. **Sequence Hypothesis**: The initial hypothesis given is that the number of regions \( a_n \) is given by the sequence:
   \[
   a_n = 2^{n+2} - 6 \quad \text{for all} \quad n \ge 1
   \]
   However, this hypothesis is incorrect for larger values of \( n \).

3. **Correct Sequence**: The correct sequence for the number of regions is:
   \[
   a_n = 4n^2 - 4n + 2 = (2n-1)^2 + 1
   \]

4. **Proof by Induction**:
   - **Base Case**: For \( n = 1 \), a single convex quadrilateral divides the plane into 2 regions (one finite and one infinite). Thus, \( a_1 = 2 \).
   - **Inductive Step**: Assume that for \( n \) convex quadrilaterals, the number of regions is \( a_n = 4n^2 - 4n + 2 \).

5. **Adding One More Quadrilateral**:
   - When we add the \((n+1)\)-th quadrilateral, it can intersect each of the existing \( n \) quadrilaterals in at most 4 points (since each quadrilateral has 4 sides).
   - Each intersection point can potentially create a new region. Therefore, the \((n+1)\)-th quadrilateral can intersect the existing \( n \) quadrilaterals in at most \( 4n \) points.
   - Each intersection point can create a new region, so the number of new regions created is at most \( 4n \).

6. **Calculating the New Number of Regions**:
   - The total number of regions after adding the \((n+1)\)-th quadrilateral is:
     \[
     a_{n+1} = a_n + 4n
     \]
   - Substituting the inductive hypothesis \( a_n = 4n^2 - 4n + 2 \):
     \[
     a_{n+1} = (4n^2 - 4n + 2) + 4n = 4n^2 + 2
     \]
   - Simplifying, we get:
     \[
     a_{n+1} = 4(n+1)^2 - 4(n+1) + 2
     \]

7. **Conclusion**: By induction, the maximal number of regions created by \( n \) convex quadrilaterals is:
   \[
   a_n = 4n^2 - 4n + 2
   \]

The final answer is \( \boxed{ 4n^2 - 4n + 2 } \).