How do I find the number of elements of a matrix with distance n from a specific element?

How do I find number of elements surrounding a specific element with a distance of n from a specific element.

For example A = [1 2 3 9;4 5 6 7; 8 9 2 3]

for the first element 1 i.e A(1,1) the number of elements with a distance of 1 is 3 (they are 2,4 and 5) and for 6 i.e A(2,3) the number is 8 ( they are 2,5,9,2,3,7,9 and 3).

for the first element 1 i.e A(1,1) the number of surrounding elements with a distance of 2 is 5 (they are 8,9,2,6 and 3) and for 6 i.e A(2,3) the number is 3 (they are 1,4 and 8).

and so on..

Any help is appreciated. Thanks.

[Guillaume]

I don't see the significance of the numbers in the matrix.

This seems like a geometry question rather than a matlab one: how to calculate the perimeter of a clipped square.

[Nitesh Suryavanshi]

Ya thats actually what i want. I would also like to know how to get the values of the elements at these positions. Thank you.