Set the iterations, then click the flag. For larger iterations, use turbo mode to speed up the process. Something to think about... can there be numbers higher than 3? (Answer in the comments to see if you're correct!)
This is based off of an older project of mine about the same topic. I redid it with a script that can in theory generate infinity of these sequences. However, even only at the 30th, it's already 5808 digits long. So... Similar to the Fibonacci sequence, I find these fun to show people and watch them guess the pattern. These are so cool because they're not your typical arithmetic/geometric sequence. They progress by language not formula (well that's a lie but still...).