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A126988 as a triangular array

1
21
301
4201
50001
632001
7000001
84020001
903000001
10500200001
110000000001
1264302000001

A126988 as a square array

123456789101112
10203040506
1002003004
100020003
10000200
1000002
100000
10000
1000
100
10
1
123456789101112
10203040506
1002003004
100020003
10000200
1000002
100000
10000
1000
100
10
1