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A130270 as a triangular array

1
31
612
10123
151234
2112345
28123456
361234567
4512345678

A130270 as a square array

136101521283645
11111111
2222222
333333
44444
5555
666
77
8
136101521283645
11111111
2222222
333333
44444
5555
666
77
8