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A052621 as a simple table

na(n)
02
11
22
36
448
5120
6720
75040
880640
9362880
103628800
1139916800
12958003200
136227020800
1487178291200
151307674368000
1641845579776000
17355687428096000
186402373705728000
19121645100408832000
204865804016353280000

[2,1,2,6,48,120,720,5040,80640,362880,3628800,
 39916800,958003200,6227020800,87178291200,
 1307674368000,41845579776000,355687428096000,
 6402373705728000,121645100408832000,
 4865804016353280000]