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A052612 as a simple table

na(n)
00
12
22
312
424
5240
6720
710080
840320
9725760
103628800
1179833600
12479001600
1312454041600
1487178291200
152615348736000
1620922789888000
17711374856192000
186402373705728000
19243290200817664000
202432902008176640000
21102181884343418880000
221124000727777607680000

[0,2,2,12,24,240,720,10080,40320,725760,3628800,
 79833600,479001600,12454041600,87178291200,
 2615348736000,20922789888000,711374856192000,
 6402373705728000,243290200817664000,
 2432902008176640000,102181884343418880000,
 1124000727777607680000]