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A163978 as a simple table

na(n)
13
24
36
48
512
616
724
832
948
1064
1196
12128
13192
14256
15384
16512
17768
181024
191536
202048
213072
224096
236144
248192
2512288
2616384
2724576
2832768
2949152
3065536
3198304
32131072
33196608
34262144
35393216
36524288
37786432
381048576
391572864
402097152
413145728

[3,4,6,8,12,16,24,32,48,64,96,128,192,256,384,512,
 768,1024,1536,2048,3072,4096,6144,8192,12288,
 16384,24576,32768,49152,65536,98304,131072,196608,
 262144,393216,524288,786432,1048576,1572864,
 2097152,3145728]