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A256031 as a simple table

na(n)
12
23
312
430
5240
6840
710080
845360
9725760
103991680
1179833600
12518918400
1312454041600
1493405312000
152615348736000
1622230464256000
17711374856192000
186758061133824000
19243290200817664000
202554547108585472000
21102181884343418880000
221175091669949317120000

[2,3,12,30,240,840,10080,45360,725760,3991680,
 79833600,518918400,12454041600,93405312000,
 2615348736000,22230464256000,711374856192000,
 6758061133824000,243290200817664000,
 2554547108585472000,102181884343418880000,
 1175091669949317120000]