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A281348 as a triangular array

1
21
521
16821
5326821
18910030821
69437511530821
2642147345312030821
102705823182747312030821
40747234797432193647912030821
16403395618306227954196147912030821

A281348 as a square array

125165318969426421027040747164033
12826100375147358232347995618
128301154531827743230622
1283012047319367954
128301204791961
12830120479
12830120
12830
128
12
1
125165318969426421027040747164033
12826100375147358232347995618
128301154531827743230622
1283012047319367954
128301204791961
12830120479
12830120
12830
128
12
1