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A130078 as a simple table

na(n)
31
44
52
68
716
864
932
1064
11128
12512
13256
142048
158192
1616384
174096
1865536
1932768
20131072
2165536
22262144
23524288
242097152
251048576
262097152
274194304
2816777216
298388608
30134217728
31134217728
321073741824
33134217728
34536870912
352147483648

[1,4,2,8,16,64,32,64,128,512,256,2048,8192,16384,
 4096,65536,32768,131072,65536,262144,524288,
 2097152,1048576,2097152,4194304,16777216,8388608,
 134217728,134217728,1073741824,134217728,
 536870912,2147483648]