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A133981 as a triangular array

1
43
565
6787
789109
8910111211
9101112131413
1011121314151615
111213141516171817
12131415161718192019
1314151617181920212221
141516171819202122232423

A133981 as a square array

14567891011121314
36789101112131415
58910111213141516
71011121314151617
912131415161718
11141516171819
131617181920
1518192021
17202122
192223
2124
23
14567891011121314
36789101112131415
58910111213141516
71011121314151617
912131415161718
11141516171819
131617181920
1518192021
17202122
192223
2124
23