=96 =6n-36
This was also correct, and I know this from my earlier explanation of squares above or on the right of n being positive, and squares beneath or left of n being negative.
The formula for working out the original 3 stair is 6n+44.
n+10
+10
n+10 n+10
+1
n n+1 n+2
The +10’s represent the next row up on the grid. These could also be called g, so the formula could also be 6n+4g+4.
We could ...