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A049581 as a triangular array

0
11
202
3113
42024
531135
6420246
75311357
864202468
9753113579
1086420246810
11975311357911
12108642024681012

A049581 as a square array

0123456789101112
1012345678910
21012345678
3210123456
432101234
54321012
6543210
765432
87654
9876
1098
1110
12
0123456789101112
1012345678910
21012345678
3210123456
432101234
54321012
6543210
765432
87654
9876
1098
1110
12