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A261297 as a triangular array

2
14
468
2357
468910
357111317
4689101214
3571113171923
5711131719232931
571113171923293137
6891012141516182021
71113171923293137414347
68910121415161820212224
711131719232931374143475359
111317192329313741434753596167

A261297 as a square array

2142434355676711
46365657781181113
858787111191391317
791191113131017101719
1013101317171219121923
17121719191423142329
141923231529152931
2329291631163137
31311837183741
372041204143
2143214347
47224753
245359
5961
67
2142434355676711
46365657781181113
858787111191391317
791191113131017101719
1013101317171219121923
17121719191423142329
141923231529152931
2329291631163137
31311837183741
372041204143
2143214347
47224753
245359
5961
67