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A026739 as a simple table

na(n)
01
11
22
38
472
5384
63840
780640
8645120
910321920
10309657600
113715891200
12102187008000
133310859059200
1451011754393600
151428329123020800
1668559797904998400
171942527607308288000

[1,1,2,8,72,384,3840,80640,645120,10321920,
 309657600,3715891200,102187008000,3310859059200,
 51011754393600,1428329123020800,68559797904998400,
 1942527607308288000]