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A131252 as a triangular array

1
21
431
7631
1211731
201914731
33322615731
5453463015731
888779573115731
143142133104623115731

A131252 as a square array

12471220335488143
1361119325387142
13714264679133
137153057104
137153162
1371531
13715
137
13
1
12471220335488143
1361119325387142
13714264679133
137153057104
137153162
1371531
13715
137
13
1