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A051162 as a triangular array

0
12
234
3456
45678
5678910
6789101112
7891011121314
8910111213141516
9101112131415161718
1011121314151617181920

A051162 as a square array

012345678910
234567891011
456789101112
678910111213
891011121314
101112131415
1213141516
14151617
161718
1819
20
012345678910
234567891011
456789101112
678910111213
891011121314
101112131415
1213141516
14151617
161718
1819
20