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A274728 as a triangular array

1
21
562
1424164
419668488
12238429626014416
365153613001632104043232
1094614457281036893084132129664
32812457625268661328494852912165243888128
984298304111512421904771300

A274728 as a square array

1251441122365109432819842
162496384153661442457698304
216682961300572825268111512
44826016321036866132421904
81441040930884948771300
16432413252912
32129616524
643888
128
1251441122365109432819842
162496384153661442457698304
216682961300572825268111512
44826016321036866132421904
81441040930884948771300
16432413252912
32129616524
643888
128