Inspired by Problem 18, create a bullseye matrix with the addition of padding equal to 0 between concentric rings. Matrices are square with outer ring equal to input n.
n=1
1
n=2
2 2 2 2 2
2 0 0 0 2
2 0 1 0 2
2 0 0 0 2
2 2 2 2 2
n=3
3 3 3 3 3 3 3 3 3
3 0 0 0 0 0 0 0 3
3 0 2 2 2 2 2 0 3
3 0 2 0 0 0 2 0 3
3 0 2 0 1 0 2 0 3
3 0 2 0 0 0 2 0 3
3 0 2 2 2 2 2 0 3
3 0 0 0 0 0 0 0 3
3 3 3 3 3 3 3 3 3
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