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A144891 as a triangular array

1
51
3051
2105551
16803605551
1512036304855551
1512002982043804855551
16632003213003957050054855551
1995840032256004218004332050054855551
259459200388080004265100470550464455005

A144891 as a square array

1530210168015120151200166320019958400259459200
1555360363029820321300322560038808000
15554854380395704218004265100
1555485500543320470550
1555485500546445
15554855005
1555
15
1
1530210168015120151200166320019958400259459200
1555360363029820321300322560038808000
15554854380395704218004265100
1555485500543320470550
1555485500546445
15554855005
1555
15
1