14.1 is called Long pyramid or Pyramid with continuation or something like that. It is usually played using Free pyramid rules - any ball can be used as a cue ball, so it offers far more options on every shot.
Actually in pyramid players usually count longest runs across multiple innings until the first miss. So if you break, runout, then opponent breaks, misses, you take turn and runout - they says it was 16 ball run, so these numbers apply both to Long pyramid and Free pyramid (which are standard frames to 8 pocketed balls).
And for top players the average run in Free pyramid is about 5. There are numerous 20-30 ball runs.
Yes, you heard it right! They play to 5 frames and manage to break and run in 4 of them even with pockets like these. This is what "any ball as a cue ball" rules allows you to do. Really fascinating!