OCTAGON NUMBERS

There is a logical pattern to each octagon. Find the missing number.

Last Week's Answers:

- 7 - 9 + 11 + 13 - 15 - 17 + 19 , + 1 x 2 + 4 + 1 x 2 + 4 + 1, + 16 + 8 + 14 + 7 + 12 + 6 + 10, x 2 + 2 - 8 x 2 + 2 - 8 x 2, + 8 + 64 + 7 + 49 + 6 + 36 + 5