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A131782 as a triangular array

1
51
1151
191151
29191151
4129191151
554129191151
71554129191151
8971554129191151
1098971554129191151
1311098971554129191151
1551311098971554129191151

A131782 as a square array

1511192941557189109131155
1511192941557189109131
1511192941557189109
1511192941557189
15111929415571
151119294155
1511192941
15111929
151119
1511
15
1
1511192941557189109131155
1511192941557189109131
1511192941557189109
1511192941557189
15111929415571
151119294155
1511192941
15111929
151119
1511
15
1