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A292280 as a simple table

na(n)
01
1-1
2-2
3-4
4-18
5-84
6-564
7-3984
8-33504
9-307728
10-3156192
11-35254080
12-429350400
13-5641133760
14-79720588800
15-1204747741440
16-19400679325440
17-331599765565440
18-5996988417784320
19-114408970262922240
20-2296442484579686400
21-48379417944213196800

[1,-1,-2,-4,-18,-84,-564,-3984,-33504,-307728,
 -3156192,-35254080,-429350400,-5641133760,
 -79720588800,-1204747741440,-19400679325440,
 -331599765565440,-5996988417784320,
 -114408970262922240,-2296442484579686400,
 -48379417944213196800]