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A051125 as a triangular array

1
22
323
4334
54345
654456
7654567
87655678
987656789
109876678910
111098767891011
121110987789101112
131211109878910111213
1413

A051125 as a square array

1234567891011121314
22345678910111213
3334567891011
44445678910
555556789
66666678
7777777
888888
99999
10101010
111111
1212
13
1234567891011121314
22345678910111213
3334567891011
44445678910
555556789
66666678
7777777
888888
99999
10101010
111111
1212
13