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A274139 as a simple table

na(n)
12
22
38
42
532
68
7128
82
9512
1032
112048
128
138192
14128
1532768
162
17131072
18512
19524288
2032
212097152
222048
238388608
248
2533554432
268192
27134217728
28128
29536870912
3032768
312147483648
322
338589934592
34131072
3534359738368
36512
37137438953472
38524288
39549755813888
4032

[2,2,8,2,32,8,128,2,512,32,2048,8,8192,128,32768,
 2,131072,512,524288,32,2097152,2048,8388608,8,
 33554432,8192,134217728,128,536870912,32768,
 2147483648,2,8589934592,131072,34359738368,512,
 137438953472,524288,549755813888,32]