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A257426 as a triangular array

512
26162616
10684765210684
41140272443030941140
150016103575117324119393150016
514920367929450756449022403951514920
1700100124658515572271770206129091012932421700100
548735641373165347670

A257426 as a square array

5122616106844114015001651492017001005487356
261676522724410357536792912465854137316
106843030911732445075615572275347670
411401193934490221770206
1500164039511290910
5149201293242
1700100
5122616106844114015001651492017001005487356
261676522724410357536792912465854137316
106843030911732445075615572275347670
411401193934490221770206
1500164039511290910
5149201293242
1700100