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A275723 as a triangular array

1
12
123
1224
12345
122456
1234347
12242678
123424789
12242678410
1234547891011
12245678461112
123434589411813
122426584411121314
1234243894118131415

A275723 as a square array

111111111111111
22222222222222
3232323232323
444444444444
55322255322
6464646464
777777553
88888888
9494949
10106444
1111111111
128128
131313
1414
15
111111111111111
22222222222222
3232323232323
444444444444
55322255322
6464646464
777777553
88888888
9494949
10106444
1111111111
128128
131313
1414
15