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A187760 as a triangular array

1
32
413
5324
64135
753246
8641357
97532468
1086413579
119753246810
12108641357911

A187760 as a square array

13456789101112
21345678910
321345678
43213456
5432134
654321
76543
8765
987
109
11
13456789101112
21345678910
321345678
43213456
5432134
654321
76543
8765
987
109
11