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A166373 as a triangular array

0
01
012
0013
00124
001235
0012346
00112457
000123468
0001234579
000123456810
0001123467911
000112345781012
000112345689

A166373 as a square array

00000000000000
1100000000000
211111000000
32221111111
4332222111
544333222
65444333
7655444
876655
98776
10988
11109
12
00000000000000
1100000000000
211111000000
32221111111
4332222111
544333222
65444333
7655444
876655
98776
10988
11109
12