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A127899 as a triangular array

1
-22
0-33
00-44
000-55
0000-66
00000-77
000000-88
0000000-99
00000000-1010
000000000-1111
0000000000-1212

A127899 as a square array

1-20000000000
2-3000000000
3-400000000
4-50000000
5-6000000
6-700000
7-80000
8-9000
9-1000
10-110
11-12
12
1-20000000000
2-3000000000
3-400000000
4-50000000
5-6000000
6-700000
7-80000
8-9000
9-1000
10-110
11-12
12