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A059222 as a simple table

na(n)
11
21
34
41
516
61
764
81
9256
101
111024
121
134096
141
1516384
161
1765536
181
19262144
201
211048576
221
234194304
241
2516777216
261
2767108864
281
29268435456
301
311073741824
321
334294967296
341
3517179869184
361
3768719476736
381
39274877906944
401
411099511627776
421
434398046511104

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