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A263905 as a triangular array

1
12
123
1265
126138
126203113
12620617321
126207618517234
126207626957739955
1262076300979178893289
12620763001189355255402177144
12620763001252

A263905 as a square array

111111111111
22222222222
3666666666
51320202020202020
831617676767676
1373185269300300300
2117257797911891252
3439917883552
559325540
892177
144
111111111111
22222222222
3666666666
51320202020202020
831617676767676
1373185269300300300
2117257797911891252
3439917883552
559325540
892177
144