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A124355 as a simple table

na(n)
10
20
32
46
524
6120
7720
85040
940320
10362880
113628800
1239916800
13479001600
146227020800
1587178291200
161307674368000
1720922789888000
18355687428096000
196402373705728000
20121645100408832000
212432902008176640000

[0,0,2,6,24,120,720,5040,40320,362880,3628800,
 39916800,479001600,6227020800,87178291200,
 1307674368000,20922789888000,355687428096000,
 6402373705728000,121645100408832000,
 2432902008176640000]