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A247208 as a simple table

na(n)
11
22
34
48
516
632
764
8128
9256
10512
111024
122048
134096
148192
1516384
1632768
1765536
18131072
19262144
20429327
21524288
22858654
231048576
241717308
252097152
263434616
274194304
286869232
298388608
3013738464
3114583415
3216777216
3327476928
3429166830
3531995179
3633554432
3746455089
3854953856
3957420033
4058333660
4158473815

[1,2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,
 16384,32768,65536,131072,262144,429327,524288,
 858654,1048576,1717308,2097152,3434616,4194304,
 6869232,8388608,13738464,14583415,16777216,
 27476928,29166830,31995179,33554432,46455089,
 54953856,57420033,58333660,58473815]