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A131251 as a triangular array

1
21
331
4631
510731
61514731
7212515731
828413015731
93663563115731
10459298623115731

A131251 as a square array

12345678910
136101521283645
1371425416392
13715305698
137153162
1371531
13715
137
13
1
12345678910
136101521283645
1371425416392
13715305698
137153162
1371531
13715
137
13
1