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A093114 as a simple table

na(n)
11
2-2
3-2
4-16
514
664
7-484
8-2048
93798
10-7168
1196292
12131072
13-1247476
143964928
15-27170632
16-67108864
17220816742
18-497811456
19993377620
20-3758096384
2138457826404
22-201938960384
231217833409416
241099511627776
25-4275253627140

[1,-2,-2,-16,14,64,-484,-2048,3798,-7168,96292,
 131072,-1247476,3964928,-27170632,-67108864,
 220816742,-497811456,993377620,-3758096384,
 38457826404,-201938960384,1217833409416,
 1099511627776,-4275253627140]