Concentric Rugs

Create a function that takes in parameter n and generates an n x n (where n is odd) concentric rug.

The center of a concentric rug is 0, and the rug "fans-out", as show in the examples below.

Examples

generate_rug(1) ➞ [
  [0]
]

generate_rug(3) ➞ [
  [1, 1, 1],
  [1, 0, 1],
  [1, 1, 1]
]

generate_rug(5) ➞ [
  [2, 2, 2, 2, 2],
  [2, 1, 1, 1, 2],
  [2, 1, 0, 1, 2],
  [2, 1, 1, 1, 2],
  [2, 2, 2, 2, 2]
]

generate_rug(7) ➞ [
  [3, 3, 3, 3, 3, 3, 3],
  [3, 2, 2, 2, 2, 2, 3],
  [3, 2, 1, 1, 1, 2, 3],
  [3, 2, 1, 0, 1, 2, 3],
  [3, 2, 1, 1, 1, 2, 3],
  [3, 2, 2, 2, 2, 2, 3],
  [3, 3, 3, 3, 3, 3, 3]
]

Notes

• n >= 0.
• Always increment by 1 each "layer" outwards you travel.