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A156991 as a triangular array

1
01
026
062460
024120360840
01207202520672015120
072050402016060480151200332640
0504040320181440604800166320039916808648640
040320362880181440066528001995840051891840121080960259459200

A156991 as a square array

100000000
12624120720504040320
624120720504040320362880
603602520201601814401814400
8406720604806048006652800
15120151200166320019958400
332640399168051891840
8648640121080960
259459200
100000000
12624120720504040320
624120720504040320362880
603602520201601814401814400
8406720604806048006652800
15120151200166320019958400
332640399168051891840
8648640121080960
259459200