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A131919 as a triangular array

1
33
535
7447
95559
11666611
137777713
1588888815
17999999917
19101010101010101019

A131919 as a square array

135791113151719
3345678910
545678910
75678910
9678910
1178910
138910
15910
1710
19
135791113151719
3345678910
545678910
75678910
9678910
1178910
138910
15910
1710
19