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A245765 as a simple table

na(n)
01
11
25
354
41004
528500
61145220
761822320
84314308544
9377894704320
1040585486536000
115244015013776000
12802446580009071360
13143506045946368385280
1429655761650514250451200
157012678074108426720000000

[1,1,5,54,1004,28500,1145220,61822320,4314308544,
 377894704320,40585486536000,5244015013776000,
 802446580009071360,143506045946368385280,
 29655761650514250451200,7012678074108426720000000]