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A354699 as a triangular array

0
21
453
5674
78896
891011127
1011121314159
1112131315161710
131414161718192012
14151617181820202213
1617181920212223242515
171819202122232425262716

A354699 as a square array

024578101113141617
15689111214151718
37810121314161819
4911131316171920
612141517182021
7151618182122
91719202223
1020202324
12222425
132526
1527
16
024578101113141617
15689111214151718
37810121314161819
4911131316171920
612141517182021
7151618182122
91719202223
1020202324
12222425
132526
1527
16