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A261764 as a triangular array

1
01
013
01713
01254973
0181261381501
013311531261133314051
011303907319993275533259337633
01593763393165873253233313713354033394353
0126785465769143647325402333326473387079342336734596553

A261764 as a square array

1000000000
111111111
3725813311303593726785
13492611531907363393465769
733812611199931658731436473
5013331275532532332540233
4051325933137133326473
376333540333870793
3943534233673
4596553
1000000000
111111111
3725813311303593726785
13492611531907363393465769
733812611199931658731436473
5013331275532532332540233
4051325933137133326473
376333540333870793
3943534233673
4596553