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A026931 as a triangular array

1
01
112
0112
12334
023445
1256778
024789910
137101314151516
03611141718191920
1391420232627282829
03816222831343536

A026931 as a square array

101010101010
11122223333
2133547698
2346710111416
447813142022
57914172328
8915182631
1015192734
16192835
202836
29
101010101010
11122223333
2133547698
2346710111416
447813142022
57914172328
8915182631
1015192734
16192835
202836
29