1 1
   2 1 2
   3 1 2 3
   4 1 2 3 4
   5 1 2 3 4 5
   6 1 2 3 4 5 6
   7 1 2 3 4 5 6 7
   8 1 2 3 4 5 6 7 8
   9 1 2 3 4 5 6 7 8 9
  10 1 2 3 4 5 6 7 8 9 10
  11 1 2 3 4 5 6 7 8 9 10 11
  12 1 2 3 4 5 6 7 8 9 10 11 12
  13 1 2 3 4 5 6 7 8 9 10 11 12 13
  14 1
  15 1 undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined
  16 1
  17 1 2
  18 1 2 3
  19 1 2 3 4
  20 1 2 3 4 5
  21 1 2 3 4 5 6
  22 1 2 3 4 5 6 7
  23 1 2 3 4 5 6 7 8
  24 1 2 3 4 5 6 7 8 9
  25 1 2 3 4 5 6 7 8 9 10
  26 1 2 3 4 5 6 7 8 9 10 11
  27 1 2 3 4 5 6 7 8 9 10 11 12
  28 1 2 3 4 5 6 7 8 9 10 11 12 13
  29 1
  30 1 undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined