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A007120 as a simple table

na(n)
01
11
2-2
3-3
416
5-10
6-114
7462
8-496
9-2952
1016920
11-31680
12-130008
131707576
14-14259504
15138375720
16-1652311680
1722238105280
18-321916019904
194959460972224
20-81123831838080
211405677742882560
22-25732182778727040
23496324987642915200
24-10061966722201900416

[1,1,-2,-3,16,-10,-114,462,-496,-2952,16920,
 -31680,-130008,1707576,-14259504,138375720,
 -1652311680,22238105280,-321916019904,
 4959460972224,-81123831838080,1405677742882560,
 -25732182778727040,496324987642915200,
 -10061966722201900416]