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A338872 as a triangular array

1
35
276
101284
916191424
111531271820
13172143302238
2333414740482646
366335398870446245
32665571526028422951
2586906798565434739157

A338872 as a square array

132109111323363225
571216151733636686
6819312141355590
414274347397167
24183040885298
202248706056
3826442854
46624234
452973
5191
57
132109111323363225
571216151733636686
6819312141355590
414274347397167
24183040885298
202248706056
3826442854
46624234
452973
5191
57