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A091095 as a simple table

na(n)
01
14
2-8
364
4-128
51024
6-2048
716384
8-32768
9262144
10-524288
114194304
12-8388608
1367108864
14-134217728
151073741824
16-2147483648
1717179869184
18-34359738368
19274877906944
20-549755813888
214398046511104
22-8796093022208
2370368744177664

[1,4,-8,64,-128,1024,-2048,16384,-32768,262144,
 -524288,4194304,-8388608,67108864,-134217728,
 1073741824,-2147483648,17179869184,-34359738368,
 274877906944,-549755813888,4398046511104,
 -8796093022208,70368744177664]