Date: Wed, 6 Aug 1997 11:41:59 -0400 (EDT)

From: Alex Bogomolny

The next term will be 111221. This is obtained the following way:

look at the previous term. Start from the left and count lengths of the single digit runs:

I see one 1, next one 2, next two 1s

Did you get it?

Write down: "one 1" becomes 11, "one 2" becomes 12, "two 1s" becomes 21. That's it.