Find all integers $n \leq 3$ such that there is a set $S_n$ formed by $n$ points of the plane that satisfy the following two conditions:
    Any three points are not collinear.
    No point is found inside the circle whose diameter has ends at any two points of $S_n$.

[b]NOTE: [/b] The points on the circumference are not considered to be inside the circle.

1. **Understanding the problem:**
   We need to find all integers \( n \leq 3 \) such that there exists a set \( S_n \) of \( n \) points in the plane satisfying:
   - No three points are collinear.
   - No point lies inside the circle whose diameter is any two points of \( S_n \).

2. **Analyzing the conditions:**
   - For any three points \( A, B, \) and \( C \) in \( S_n \), they must not be collinear.
   - For any two points \( A \) and \( B \) in \( S_n \), no other point in \( S_n \) should lie inside the circle with diameter \( AB \).

3. **Considering small values of \( n \):**
   - For \( n = 1 \) and \( n = 2 \), the conditions are trivially satisfied because there are not enough points to form a circle or to check collinearity.

4. **Checking \( n = 3 \):**
   - For \( n = 3 \), consider three points \( A, B, \) and \( C \) forming a triangle. Since no three points are collinear, they form a non-degenerate triangle.
   - The circle with diameter \( AB \) will have \( C \) outside or on the circumference of this circle. Similarly, the circles with diameters \( BC \) and \( CA \) will have the other points outside or on the circumference.
   - Therefore, \( n = 3 \) satisfies the conditions.

5. **Checking \( n = 4 \):**
   - For \( n = 4 \), consider four points \( A, B, C, \) and \( D \). If these points form a convex quadrilateral, then no point lies inside the circle with diameter formed by any two points.
   - However, since \( n \leq 3 \), we do not need to consider \( n = 4 \).

6. **Conclusion:**
   - The only values of \( n \leq 3 \) that satisfy the given conditions are \( n = 1, 2, \) and \( 3 \).

The final answer is \( \boxed{ n = 1, 2, 3 } \)