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A156458 as a simple table

na(n)
22
36
468
5876
643300
73026820
8558858552
9474109634808
101011861877473980
113520221010293816000

[2,6,68,876,43300,3026820,558858552,474109634808,
 1011861877473980,3520221010293816000]