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A254390 as a triangular array

512
33723372
213043552921304
136868406548409051136868
881432471132485337964766957881432
565954854122833174326376175329586547125595659548
36317408623732385357540811762083459443587965682

A254390 as a square array

512337221304136868881432565954836317408
337235529406548471132454122833623732385
2130440905185337961743263763575408117
13686847669571753295866208345944
881432547125593587965682
5659548
512337221304136868881432565954836317408
337235529406548471132454122833623732385
2130440905185337961743263763575408117
13686847669571753295866208345944
881432547125593587965682
5659548