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A250419 as a triangular array

3
56
71710
9363820
11659912536
1310620547633572
15161370135116931061136
172326063154598275043069272
1932192764331679034415292219495528
2143013451190639916119364169352

A250419 as a square array

3579111315171921
6173665106161232321430
1038992053706069271345
2012547613513154643311906
36335169359821679039916
721061750434415119364
136306929221169352
2729495
528
3579111315171921
6173665106161232321430
1038992053706069271345
2012547613513154643311906
36335169359821679039916
721061750434415119364
136306929221169352
2729495
528