0 []
1 [[]]
2 [[], [[]]]
3 [[], [[]], [[], [[]]]]
4 [[], [[]], [[], [[]]], [[], [[]], [[], [[]]]]]
5 [[], [[]], [[], [[]]], [[], [[]], [[], [[]]]], [[], [[]], [[], [[]]], [[], [[]], [[], [[]]]]]]
6 [[], [[]], [[], [[]]], [[], [[]], [[], [[]]]], [[], [[]], [[], [[]]], [[], [[]], [[], [[]]]]], [[], [[]], [[], [[]]], [[], [[]], [[], [[]]]], [[], [[]], [[], [[]]], [[], [[]], [[], [[]]]]]]]
7 [[], [[]], [[], [[]]], [[], [[]], [[], [[]]]], [[], [[]], [[], [[]]], [[], [[]], [[], [[]]]]], [[], [[]], [[], [[]]], [[], [[]], [[], [[]]]], [[], [[]], [[], [[]]], [[], [[]], [[], [[]]]]]], [[], [[]], [[], [[]]], [[], [[]], [[], [[]]]], [[], [[]], [[], [[]]], [[], [[]], [[], [[]]]]], [[], [[]], [[], [[]]], [[], [[]], [[], [[]]]], [[], [[]], [[], [[]]], [[], [[]], [[], [[]]]]]]]]