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A373748 as a triangular array

0
01
012
01-23
01-2-34
01-2-345
01-234-56
012-34-5-67
01-2-34-5-6-78
01-2-34-5-67-89
01-2-3456-7-8910
01-2345-6-7-89-1011
01-2-34-5-6-7-89-10-1112

A373748 as a square array

0000000000000
111111111111
2-2-2-2-22-2-2-2-2-2
3-3-33-3-3-3-33-3
444444444
5-5-5-5-555-5
6-6-6-66-6-6
7-77-7-7-7
8-8-8-8-8
9999
10-10-10
11-11
12
0000000000000
111111111111
2-2-2-2-22-2-2-2-2-2
3-3-33-3-3-3-33-3
444444444
5-5-5-5-555-5
6-6-6-66-6-6
7-77-7-7-7
8-8-8-8-8
9999
10-10-10
11-11
12