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A119789 as a triangular array

0
00
000
1112
22234
333456
4445678
555678910
666789101112
777891011121314
888910111213141516

A119789 as a square array

00012345678
0012345678
012345678
23456789
45678910
67891011
89101112
10111213
121314
1415
16
00012345678
0012345678
012345678
23456789
45678910
67891011
89101112
10111213
121314
1415
16