I have a grid of 20x20 cells. I want to set a numerical value in a particular cell and then have all the other cells populate on the basis of 'Set the cell value to the maximum of the north, south, east and west cells minus 1'.



So it would look like the below, completed with 0s out toward the edges.

I tried populating each cell (apart from the one set with 20) with "=max(n20,o21,n22,m21)-1" (where n21 was the cell set with 20) but, of course, that gave me circular references all over the place.

Is there any way to do this?

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