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A099399 as a simple table

na(n)
01
16
216
332
4384
5256
64096
724576
832768
965536
101572864
111048576
124194304
1325165824
14268435456
15536870912
162147483648
174294967296
1834359738368
1968719476736
20274877906944
21549755813888
228796093022208
2317592186044416

[1,6,16,32,384,256,4096,24576,32768,65536,1572864,
 1048576,4194304,25165824,268435456,536870912,
 2147483648,4294967296,34359738368,68719476736,
 274877906944,549755813888,8796093022208,
 17592186044416]