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A306760 as a simple table

na(n)
01
12
290
3705600
44105057320000
552487876090562232320000
63487017405172854771910634342400000000
72448893405298238642974553493547144534294528000000000000
833257039167768610289435138215602132823918399655132218973388800000000000000000

[1,2,90,705600,4105057320000,
 52487876090562232320000,
 3487017405172854771910634342400000000,
 24488934052982386429745534935471445342945280000000\
 00000,
 33257039167768610289435138215602132823918399655132\
 218973388800000000000000000]