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A068878 as a simple table

na(n)
12
224
360
4720
540320
6181440
73628800
8479001600
93113510400
1087178291200
1120922789888000
12177843714048000
136402373705728000
142432902008176640000
1525545471085854720000
161124000727777607680000
17620448401733239439360000

[2,24,60,720,40320,181440,3628800,479001600,
 3113510400,87178291200,20922789888000,
 177843714048000,6402373705728000,
 2432902008176640000,25545471085854720000,
 1124000727777607680000,620448401733239439360000]