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A101653 as a simple table

na(n)
01
14
216
332
4128
5256
6512
72048
88192
916384
1032768
11131072
12262144
131048576
144194304
158388608
1633554432
1767108864
18134217728
19536870912
201073741824
214294967296
2217179869184
2334359738368
2468719476736
25274877906944

[1,4,16,32,128,256,512,2048,8192,16384,32768,
 131072,262144,1048576,4194304,8388608,33554432,
 67108864,134217728,536870912,1073741824,
 4294967296,17179869184,34359738368,68719476736,
 274877906944]