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A091804 as a simple table

na(n)
01
12
232
39216
484934656
539137889484800
61298501242170900480000
74221953171600428240994304000000
81757091687362157576297527910177177600000000

[1,2,32,9216,84934656,39137889484800,
 1298501242170900480000,
 4221953171600428240994304000000,
 1757091687362157576297527910177177600000000]