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A089819 as a simple table

na(n)
12
22
32
44
54
68
78
816
932
1064
1164
12128
13128
14256
15512
161024
171024
182048
192048
204096
218192
2216384
2316384
2432768
2565536
26131072
27262144
28524288
29524288
301048576
311048576
322097152
334194304
348388608
3516777216
3633554432
3733554432
3867108864

[2,2,2,4,4,8,8,16,32,64,64,128,128,256,512,1024,
 1024,2048,2048,4096,8192,16384,16384,32768,65536,
 131072,262144,524288,524288,1048576,1048576,
 2097152,4194304,8388608,16777216,33554432,
 33554432,67108864]