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A275204 as a triangular array

1
11
131
1451
16871
17151291
19222516111
11031433520131
1124168654524151
1135499113875528171
115661431781591096532191
116821932732672051317536211
118982583984303572511538540231

A275204 as a square array

1111111111111
134679101213151618
1581522314154668298
171225436899143193258
19163565113178273398
111204587159267430
1132455109205357
1152865131251
1173275153
1193685
12140
123
1
1111111111111
134679101213151618
1581522314154668298
171225436899143193258
19163565113178273398
111204587159267430
1132455109205357
1152865131251
1173275153
1193685
12140
123
1