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A081411 as a simple table

na(n)
11
22
34
416
532
6128
7256
81024
96144
1012288
1173728
12294912
13589824
142359296
1514155776
1684934656
17169869312
181019215872
194076863488
208153726976
2148922361856
22195689447424
231174136684544
249393093476352
2537572373905408
2675144747810816
27300578991243264
28601157982486528

[1,2,4,16,32,128,256,1024,6144,12288,73728,294912,
 589824,2359296,14155776,84934656,169869312,
 1019215872,4076863488,8153726976,48922361856,
 195689447424,1174136684544,9393093476352,
 37572373905408,75144747810816,300578991243264,
 601157982486528]