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A262710 as a simple table

na(n)
01
1-4
216
3-64
4256
5-1024
64096
7-16384
865536
9-262144
101048576
11-4194304
1216777216
13-67108864
14268435456
15-1073741824
164294967296
17-17179869184
1868719476736
19-274877906944
201099511627776
21-4398046511104
2217592186044416
23-70368744177664
24281474976710656

[1,-4,16,-64,256,-1024,4096,-16384,65536,-262144,
 1048576,-4194304,16777216,-67108864,268435456,
 -1073741824,4294967296,-17179869184,68719476736,
 -274877906944,1099511627776,-4398046511104,
 17592186044416,-70368744177664,281474976710656]