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A052849 as a simple table

na(n)
00
12
24
312
448
5240
61440
710080
880640
9725760
107257600
1179833600
12958003200
1312454041600
14174356582400
152615348736000
1641845579776000
17711374856192000
1812804747411456000
19243290200817664000
204865804016353280000
21102181884343418880000
222248001455555215360000

[0,2,4,12,48,240,1440,10080,80640,725760,7257600,
 79833600,958003200,12454041600,174356582400,
 2615348736000,41845579776000,711374856192000,
 12804747411456000,243290200817664000,
 4865804016353280000,102181884343418880000,
 2248001455555215360000]