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A324439 as a simple table

na(n)
01
12
21081600
3528465082730906880000
429276520893554373473343522853366005760000000000
55719545329208791496596894540018824083491259163047733746620041978183680000000000000000

[1,2,1081600,528465082730906880000,
 29276520893554373473343522853366005760000000000,
 57195453292087914965968945400188240834912591630477\
 33746620041978183680000000000000000]