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A278995 as a simple table

na(n)
11
2-2
3-4
48
516
6-32
7-64
8128
94864
10-9728
11-37888
12223232
13446464
14-1482752
155586944
16-11173888
17-56557568
18-2490368
19-4980736
20472383488
21-10851713024
2221703426048
2390592772096
24-263779778560
25-10023631585280
26-4209210589970432
27-50541367159422976

[1,-2,-4,8,16,-32,-64,128,4864,-9728,-37888,
 223232,446464,-1482752,5586944,-11173888,
 -56557568,-2490368,-4980736,472383488,
 -10851713024,21703426048,90592772096,
 -263779778560,-10023631585280,-4209210589970432,
 -50541367159422976]