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A126089 as a simple table

na(n)
01
1-4
24
30
4-48
5-960
6-20160
7-483840
8-13305600
9-415134720
10-14529715200
11-564583219200
12-24135932620800
13-1126343522304000
14-56992982228582400
15-3108708121559040000
16-181859425111203840000
17-11359219476176732160000
18-754576722346025779200000

[1,-4,4,0,-48,-960,-20160,-483840,-13305600,
 -415134720,-14529715200,-564583219200,
 -24135932620800,-1126343522304000,
 -56992982228582400,-3108708121559040000,
 -181859425111203840000,-11359219476176732160000,
 -754576722346025779200000]