-1,2, - 4,8, - 16,32. What is the number of 2007 and 2008 in this column

-1,2, - 4,8, - 16,32. What is the number of 2007 and 2008 in this column

The number in 2007 is - 2 ^ 2006
The number of 2008 is 2 ^ 2007