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A181109 as a triangular array

1
11
131
1531
17431
195431
11175431
113875431
11510975431
1171111975431
119131211975431
12114131211975431
1231515131311975431

A181109 as a square array

1111111111111
1357911131517192123
1345781011131415
13457911121315
134579111213
1345791113
13457911
134579
13457
1345
134
13
1
1111111111111
1357911131517192123
1345781011131415
13457911121315
134579111213
1345791113
13457911
134579
13457
1345
134
13
1