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A080369 as a simple table

na(n)
11
21
36
4720
56652800
61693749657600
7367216146859161600000
81888288177044984240734208000000
94157567140515322460268246337585152000000000

[1,1,6,720,6652800,1693749657600,
 367216146859161600000,
 1888288177044984240734208000000,
 4157567140515322460268246337585152000000000]