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A071769 as a simple table

na(n)
10
2-1
34
4-12
5-64
6-208
71088
8-960
9-8192
10-6400
1158368
12-27648
13-344064
14-151552
151982464
16-638976
17-10485760
18-3211264
1954788096
20-13369344
21-272629760
22-63963136
231346371584
24-264241152
25-6442450944
26-1224736768
2730668750848

[0,-1,4,-12,-64,-208,1088,-960,-8192,-6400,58368,
 -27648,-344064,-151552,1982464,-638976,-10485760,
 -3211264,54788096,-13369344,-272629760,-63963136,
 1346371584,-264241152,-6442450944,-1224736768,
 30668750848]