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A084221 as a simple table

na(n)
01
13
24
312
416
548
664
7192
8256
9768
101024
113072
124096
1312288
1416384
1549152
1665536
17196608
18262144
19786432
201048576
213145728
224194304
2312582912
2416777216
2550331648
2667108864
27201326592
28268435456
29805306368
301073741824
313221225472
324294967296
3312884901888

[1,3,4,12,16,48,64,192,256,768,1024,3072,4096,
 12288,16384,49152,65536,196608,262144,786432,
 1048576,3145728,4194304,12582912,16777216,
 50331648,67108864,201326592,268435456,805306368,
 1073741824,3221225472,4294967296,12884901888]