Is it possible to have an array display in cells of a collection view?

The simplest would be to save the generated arrays in an array (of arrays):

var arraysForDataSource : [[Int]] = []

let original = [1,  2,  3,  4,  5,  6]
var currentArray = original

var stop = false
repeat {
     currentArray = currentArray.map() { ($0 + 2) % 25 + 1}
     arraysForDataSource.append(currentArray)
     stop = currentArray[0] == 25   
} while !stop

And use it in delegate function

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell=collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! discoCueCell
        cell.backgroundColor=UIColor.clear
        let arrayForCell = arraysForDataSource[indexPath.row]
     // Do whatever you need with the array…
}

Does it answer your question ?

How do you want to display the array ?

If you just want the list of elements:

- create a label

- put the text in it.

Could look like this:

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! discoCueCell
        cell.backgroundColor=UIColor.clear
        let arrayForCell = arraysForDataSource[indexPath.row]

     // 1. Remove existing subviews, to avoid adding another one each time
        for view in cell.contentView.subviews {
            view.removeFromSuperview()
        }

     //   2. Create the label, and position and size as needed
        let label = UITextView(frame: CGRect(x: 5, y: 0, width: 60, height: 20))     // adapt as needed
        label.isUserInteractionEnabled = false  // Don't allow editing of a cell

     // 3. Write the array in the label
        label.text = arrayForCell.reduce("") { text, val in text == "" ? "\(val)" : "\(text),\(val)" }
     
     // 4. Add the label to the contentView
        cell.contentView.addSubview(label)

     // 5. return cell     
     return cell
}