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A090349 as a triangular array

1
21
331
4601
5101001
61520001
7213535001
8280700001
936841261260001
1045120025200001

A090349 as a square array

12345678910
136101521283645
10102035084120
10035701260
1000126252
10000
1000
100
10
1
12345678910
136101521283645
10102035084120
10035701260
1000126252
10000
1000
100
10
1