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A079303 as a simple table

na(n)
31
418
543920
64397760
7122377651200
830993058252800
93921055557027840000
10711860093387348628602880000
11551343268152723132127641600000
12567168796017902020698219516788736000000

[1,18,43920,4397760,122377651200,30993058252800,
 3921055557027840000,711860093387348628602880000,
 551343268152723132127641600000,
 567168796017902020698219516788736000000]