Generate a distribution of pseudo-random numbers with a guaranteed spacing between consecutive numbers.

Input parameters:

1. N → Length of number sequence.
2. Iv → Interval for random numbers.
3. Av → Series of avoidance radii for previous values.
4. Rn → Random engine used for distribution.

Output parameters:

1. Sq → Pseudo-random number sequence.
2. Vd → Validity of numbers in sequence.
3. Xn → Number of invalid numbers in sequence.