Solution to: Strange Sequence
The system behind the sequence is exactly the same as in the first sequence in this puzzle. Each number (except the first) "describes" the preceding number (when read from left to right). Therefore, the number that follows 1113122110 is 311311222110: three times a "1", one time a "3", one time a "1", two times a "2", two times a "1", and one time a "0".
