1, 2, 2,
That's one one, and two twos. So we assume it goes like this:
One one, two twos, three threes, four fours, five fives, six sixes, seven sevens, eight eights,...
1,2,2,3,3,3,4,4,4,4,5,5,5,5,5,6,6,6,6,6,6,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,...
↑
The 9th term is a 4.
Edwin