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A198633 as a simple table

na(n)
03
14
28
316
432
564
6128
7256
8512
91024
102048
114096
128192
1316384
1432768
1565536
16131072
17262144
18524288
191048576
202097152
214194304
228388608
2316777216
2433554432
2567108864
26134217728
27268435456
28536870912
291073741824
302147483648

[3,4,8,16,32,64,128,256,512,1024,2048,4096,8192,
 16384,32768,65536,131072,262144,524288,1048576,
 2097152,4194304,8388608,16777216,33554432,
 67108864,134217728,268435456,536870912,1073741824,
 2147483648]