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A128255 as a triangular array

1
11
231
2651
3101371
315272391
42148573614
2878118104521315
36118218246172711515
4517037051045826593171

A128255 as a square array

1122334283645
13610152178118170
15132748118218370
172357104246510
193652172458
111371265
411593
5117
51
1122334283645
13610152178118170
15132748118218370
172357104246510
193652172458
111371265
411593
5117
51