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A370668 as a simple table

na(n)
11
23
36
428
5120
6740
75040
840416
9362898
103629400
1139916800
12479006070
136227020800
1487178326480
151307674369200
1620922790210656
17355687428096000
186402373709004720
19121645100408832000
202432902008212929224
2151090942171709545840
221124000727778046764800

[1,3,6,28,120,740,5040,40416,362898,3629400,
 39916800,479006070,6227020800,87178326480,
 1307674369200,20922790210656,355687428096000,
 6402373709004720,121645100408832000,
 2432902008212929224,51090942171709545840,
 1124000727778046764800]