Problem
First name
Isobel Ellis
School
TGS
Country
Age
12
Charlies squares
(8,4)
(59,21)
(nx2+(n-1),n+1)
Yes the formula works with n being a minus number.
Yes the formula can be adapted for the corners because for the bottom left hand corner the formula changes to (nx2+(n-2),(n-1) in this only two digits have changed from the middle point formula.