1
1 1
2 1
1 2 1 1
1 1 1 2 2 1
3 1 2 2 1 1
1 3 1 1 2 2 2 1
The first row has one 1, so the second row is 1 1.
The second row has two 1's, so the third row is 2 1.
The third row has one 2 and one 1, so the fourth row is 1 2 1 1.
The fourth row has 1 one, one 2, and 2 1's, so the fifth row is 1 1 1 2 2 1.
The fifth row has three 1's, two 2's, and one 1, so the sixth row is 3 1 2 2 1 1.
The sixth row has one 3, one 1, two 2's, and two 1's, so the seventh row is 1 3 1 1 2 2 2 1.