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A277709 as a triangular array

1
25
31013
4392629
920755841
621521478261
7784511620712285
81115093164291170125
814019294189244411250173
1810510435414381340579346209
234216523267582657500819418253
124390213328131822765692927506281

A277709 as a square array

1234967881182312
5103920217811401054243
13267552451501910416590
29581471169329435232213
418220716418941467328
61122291244381582131
85170411340657822
125250579500765
173346819692
209418927
253506
281
1234967881182312
5103920217811401054243
13267552451501910416590
29581471169329435232213
418220716418941467328
61122291244381582131
85170411340657822
125250579500765
173346819692
209418927
253506
281