The first line is 1, the second line is 2, 3, the third line is 4, 5, 6, 7, and the fourth line is 8.9.10.11.12.13.14.15

The first line is 1, the second line is 2, 3, the third line is 4, 5, 6, 7, and the fourth line is 8.9.10.11.12.13.14.15

One number in the first line
Two numbers in the second line
The fourth power of 4 numbers in the third line = 2
The fourth line is the third power of 8 numbers = 2
Number of (n-1) power of line n = 2