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A026840 as a triangular array

1
01
012
0012
00123
001234
0002345
00013456
000135678
00013578910
00002579101112
00002581012131415
000014811

A026840 as a square array

1000000000000
110000000000
21110000000
2222111000
333333221
44455554
5567788
67891011
891012
101113
1214
15
1000000000000
110000000000
21110000000
2222111000
333333221
44455554
5567788
67891011
891012
101113
1214
15