[2,1]

[3,1]

[4,1], [4,2]

[5,1], [5,2]

[6,1], [6,2], [6,3]

[7,1], [7,2], [7,3]

[8,1], [8,2], [8,3], [8,4]

[9,1], [9,2], [9,3], [9,4]

[10,1], [10,2], [10,3], [10,4], [10,5]