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A291778 as a simple table

na(n)
01
11
22
34
44
58
616
716
832
964
1064
11128
12256
13256
14512
151024
161024
172048
184096
194096
208192
2116384
2216384
2332768
2465536
2565536
26131072
27262144
28262144
29524288
301048576
311048576
322097152
334194304
344194304
358388608
3616777216
3716777216
3833554432
3967108864
4067108864

[1,1,2,4,4,8,16,16,32,64,64,128,256,256,512,1024,
 1024,2048,4096,4096,8192,16384,16384,32768,65536,
 65536,131072,262144,262144,524288,1048576,1048576,
 2097152,4194304,4194304,8388608,16777216,16777216,
 33554432,67108864,67108864]