How can I create this triangle with a code on Matlab?

LOTOR Figure 1 [ File Edit View lasert Tools Desktop Window Help Comme UE inde obslun 2 4 6 0 8 10 12 14 0 0 16 18 0 0 0 0 0 0 O 0 D 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o 0 0 0 0 0 O o 0 0 0 0 0 0 0 d O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Windows'u Etkin Windows unlestim 20 2 4 6 6 8 10 12 14 16 18 20 0 0 D 0 0 0 0 0 0 0 0 0 D 0 0 0 0 0 0 0 0 0 O 0 0 0 0 0 0 0 0 0 D 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 D D 0 0 0 0 0 0 0 0 0 0 0 0 0 B 14C Genellikle ak hp 5 & 6 7 8 9 E R T. + Y UL U O G F G H J K L. $ IN IL v B. N M M o