If we assume Moore's Law is true, and the number of transistors on a square inch of an integrated circuit doubles every 18 months, we can calculate how many times as many transistors we would expect in year 6.
Since 6 years is equivalent to 72 months (6 years x 12 months/year), we can divide 72 by 18 to find out how many times the number of transistors would double.
72 / 18 = 4
So, in year 6, we would expect the number of transistors on a square inch of an integrated circuit to double 4 times.
Therefore, there would be 2^4 = 16 times as many transistors on a square inch of integrated circuit in year 6 compared to the initial number.
Hope that helps! Let me know if you have any other questions.