NumberDIamond

Challenge: Create a number diamond like this!

                1
              1 2 1
            1 2 3 2 1
          1 2 3 4 3 2 1
        1 2 3 4 5 4 3 2 1
      1 2 3 4 5 6 5 4 3 2 1
    1 2 3 4 5 6 7 6 5 4 3 2 1
  1 2 3 4 5 6 7 8 7 6 5 4 3 2 1
1 2 3 4 5 6 7 8 9 8 7 6 5 4 3 2 1
  1 2 3 4 5 6 7 8 7 6 5 4 3 2 1
    1 2 3 4 5 6 7 6 5 4 3 2 1
      1 2 3 4 5 6 5 4 3 2 1
        1 2 3 4 5 4 3 2 1
          1 2 3 4 3 2 1
            1 2 3 2 1
              1 2 1
                1