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A075101 as a simple table

na(n)
12
22
38
44
532
632
7128
832
9512
10512
112048
121024
138192
148192
1532768
164096
17131072
18131072
19524288
20262144
212097152
222097152
238388608
242097152
2533554432
2633554432
27134217728
2867108864
29536870912
30536870912
312147483648
32134217728
338589934592
348589934592
3534359738368
3617179869184
37137438953472

[2,2,8,4,32,32,128,32,512,512,2048,1024,8192,8192,
 32768,4096,131072,131072,524288,262144,2097152,
 2097152,8388608,2097152,33554432,33554432,
 134217728,67108864,536870912,536870912,2147483648,
 134217728,8589934592,8589934592,34359738368,
 17179869184,137438953472]