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A009570 as a simple table

na(n)
00
11
2-1
31
4-4
516
6-16
7-104
8-64
94096
10-256
11-176384
12-1024
1311186176
14-4096
15-951870464
16-16384
17104932704256
18-65536
19-14544442425344
20-262144
212475749027086336
22-1048576
23-507711943251329024
24-4194304
25123460740095112380416
26-16777216

[0,1,-1,1,-4,16,-16,-104,-64,4096,-256,-176384,
 -1024,11186176,-4096,-951870464,-16384,
 104932704256,-65536,-14544442425344,-262144,
 2475749027086336,-1048576,-507711943251329024,
 -4194304,123460740095112380416,-16777216]