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A181856 as a simple table

na(n)
01
112
21440
3362880
487091200
511496038400
6376610217984000
7903864523161600
836877672544993280000
9529710888436283473920000
103496091863679470927872000000
1150785334440817577689088000000

[1,12,1440,362880,87091200,11496038400,
 376610217984000,903864523161600,
 36877672544993280000,529710888436283473920000,
 3496091863679470927872000000,
 50785334440817577689088000000]