Array
(
    [0] => 1
    [1] => 2
    [2] => 2
    [3] => 3
    [4] => 4
    [5] => 4
    [6] => 4
    [7] => 5
    [8] => 6
    [9] => 7
    [10] => 8
    [11] => 8
    [12] => 9
    [13] => 9
    [14] => 9
    [15] => 17
    [16] => 18
    [17] => 33
)