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A155543 as a simple table

na(n)
02
14
216
364
4256
51024
64096
716384
865536
9262144
101048576
114194304
1216777216
1367108864
14268435456
151073741824
164294967296
1717179869184
1868719476736
19274877906944
201099511627776
214398046511104
2217592186044416
2370368744177664

[2,4,16,64,256,1024,4096,16384,65536,262144,
 1048576,4194304,16777216,67108864,268435456,
 1073741824,4294967296,17179869184,68719476736,
 274877906944,1099511627776,4398046511104,
 17592186044416,70368744177664]