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A255238 as a triangular array

1
21
321
4331
54431
655541
7666541
87776541
988877641
10999987651
1110101010998751

A255238 as a square array

1234567891011
12345678910
1345678910
135678910
14567910
145789
14679
1468
157
15
1
1234567891011
12345678910
1345678910
135678910
14567910
145789
14679
1468
157
15
1