Consider the Post tag system described in A284116 (but adapted to the alphabet {1,2}); sequence lists the words that belong to cycles.
A289674
Consider the Post tag system described in A284116 (but adapted to the alphabet {1,2}); sequence lists the words that belong to cycles.
Terms
- a(0) =21211a(1) =112212a(2) =21211221211a(3) =112212112212a(4) =221222121111
External references
- oeis: A289674