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A376570 as a triangular array

1
12
122
1234
12345
123436
1234247
12343638
123456689
12345678810
123456689611
1234566896116
1234567881081213

A376570 as a square array

1111111111111
222222222222
23333333333
4444444444
532355555
64666666
7367667
888888
98998
106610
11118
612
13
1111111111111
222222222222
23333333333
4444444444
532355555
64666666
7367667
888888
98998
106610
11118
612
13