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A081206 as a triangular array

1
11
121
1221
13331
134431
1467641
14799741
15101416141051
1511172121171151
161525343734251561
16162942505042291661
172141648289826441

A081206 as a square array

1111111111111
122334455667
1234671011151621
134791417252941
13691621344264
1471421375082
141017345089
1511254282
15152964
161641
16
1
1111111111111
122334455667
1234671011151621
134791417252941
13691621344264
1471421375082
141017345089
1511254282
15152964
161641
16
1