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A158860 as a triangular array

1
41
721
10321
134321
1654321
19654321
227654321
2587654321
28987654321

A158860 as a square array

14710131619222528
123456789
12345678
1234567
123456
12345
1234
123
12
1
14710131619222528
123456789
12345678
1234567
123456
12345
1234
123
12
1