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A007113 as a simple table

na(n)
01
10
22
3-3
420
5-90
6594
7-4200
834544
9-316008
103207240
11-35699400
12432690312
13-5672581200
1479991160144
15-1207367605080
1619423062612480
17-331770360922560
185997105160795584
19-114373526841360000
202295170834453089920
21-48344592370577247360

[1,0,2,-3,20,-90,594,-4200,34544,-316008,3207240,
 -35699400,432690312,-5672581200,79991160144,
 -1207367605080,19423062612480,-331770360922560,
 5997105160795584,-114373526841360000,
 2295170834453089920,-48344592370577247360]