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A286312 as a triangular array

1
21
331
4531
57651
699661
7111210771
813151410781
91518181511791
1017212220151217101

A286312 as a square array

12345678910
1357911131517
136912151821
15610141822
167101520
1771115
18712
1917
110
1
12345678910
1357911131517
136912151821
15610141822
167101520
1771115
18712
1917
110
1