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A139248 as a simple table

na(n)
11
21
32
41
52
64
78
81
92
104
118
1216
1332
141
152
164
178
1816
1932
2064
21128
22256
23512
241024
252048
261
272
284
298
3016
3132
3264
33128
34256
35512
361024
372048
384096
398192
4016384
4132768
421
432
444
458
4616
4732
4864
49128
50256
51512
521024
532048
544096
558192
5616384
5732768
5865536
59131072
601
612
624
638
6416

[1,1,2,1,2,4,8,1,2,4,8,16,32,1,2,4,8,16,32,64,128,
 256,512,1024,2048,1,2,4,8,16,32,64,128,256,512,
 1024,2048,4096,8192,16384,32768,1,2,4,8,16,32,64,
 128,256,512,1024,2048,4096,8192,16384,32768,65536,
 131072,1,2,4,8,16]