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A083291 as a triangular array

0
11
222
3333
44444
555555
6666666
77777777
888888888
9999999999
012345678910
123456789101112
234567891011121314
34567891011

A083291 as a square array

01234567890123
1234567891234
234567892345
34567893456
4567894567
567895678
67896789
78978910
89891011
991011
101112
1213
14
01234567890123
1234567891234
234567892345
34567893456
4567894567
567895678
67896789
78978910
89891011
991011
101112
1213
14