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A053038 as a simple table

na(n)
11
22
34
416
532
6128
7512
84096
916384
102048
118192
1265536
1316384
1465536
158388608
16134217728
178388608
188388608
1916777216
202097152
218388608
22268435456
234398046511104
2470368744177664
2567108864
2667108864
2767108864
2868719476736

[1,2,4,16,32,128,512,4096,16384,2048,8192,65536,
 16384,65536,8388608,134217728,8388608,8388608,
 16777216,2097152,8388608,268435456,4398046511104,
 70368744177664,67108864,67108864,67108864,
 68719476736]