Don't use a search engine. Don't look it up anywhere
What is the next row of numbers in this series? Explain WHY the answer you give is correct.
1
11
21
1211
111221
312211
13112221
Unfortunately, the hidden posts hack isn't installed here, so the first correct answer will spoil it for late players. So, I am going to post a couple of filler posts to try to help players who don't want to peek at any anwers posted.