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A081521 as a triangular array

1
13
147
1357
12368
157111317
12345812
13579111315
124578101322
1379111317192129
1234567891220

A081521 as a square array

11111111111
3432523232
753735473
761147594
813597115
178118136
121310177
1513198
22219
2912
20
11111111111
3432523232
753735473
761147594
813597115
178118136
121310177
1513198
22219
2912
20