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A278657 as a triangular array

1
11
111
1111
11111
117711
1225502521
13503113115031
1415519544101195415541
155081191456864568641191450851
16134376003728857153249672885776003134361

A278657 as a square array

11111111111
1111123456
111725501555081343
1175031119541191476003
1125311410156864728857
12501954568641532496
1315511914728857
1450876003
151343
16
1
11111111111
1111123456
111725501555081343
1175031119541191476003
1125311410156864728857
12501954568641532496
1315511914728857
1450876003
151343
16
1