For example, if n=2 (maximum value), the output matrix should be
[1 1 1 1 1;
1 2 2 2 1;
1 2 1 2 1;
1 2 2 2 1;
1 1 1 1 1]
where you go from inside to outside starting from 1 to 2(maximum value) and again move back from 2 to 1.
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You should call this a volcano matrix!
Could also be named an Atoll matrix
Thanks Ned, Richard for good suggestion. I have changed Problem Title accordingly.