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A071085 as a simple table

na(n)
01
10
2-1
3-2
45
5-8
6-16
7-32
8-48
9-64
10-80
11224
12-368
13312
14-205
15-2850
165905
171817592
18-4329936
19-2004480
20-442800
2120967000
22-349316425
231853293420
24-6937330896
2524280673168
26-18727955840
27-31062538500
28-42332130415
292736294281648
30-27940194392976

[1,0,-1,-2,5,-8,-16,-32,-48,-64,-80,224,-368,312,
 -205,-2850,5905,1817592,-4329936,-2004480,-442800,
 20967000,-349316425,1853293420,-6937330896,
 24280673168,-18727955840,-31062538500,
 -42332130415,2736294281648,-27940194392976]