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A077264 as a triangular array

0
01
122
0343
13564
246785
05799106
148101211127
25811131513148
3691214161815169
07101316171921171810
1511141720202224192011
2610151821

A077264 as a square array

0010120123012
123345456756
24567889101110
3679101112131415
489121314161718
510111516172021
61213181920
714152122
8161724
91819
1020
11
0010120123012
123345456756
24567889101110
3679101112131415
489121314161718
510111516172021
61213181920
714152122
8161724
91819
1020
11