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A290555 as a simple table

na(n)
01
12
24
38
416
532
696
7128
8256
9576
101920
113328
124096
1314336
1427648
1563488
1694208
17147456
18313344
19593920
201056768
213784704
225799936
2310633216
2429917184
2558785792
26100663296
27204996608
28409993216
29652345344
301686503424
313376414720
324907335680
3314093123584

[1,2,4,8,16,32,96,128,256,576,1920,3328,4096,
 14336,27648,63488,94208,147456,313344,593920,
 1056768,3784704,5799936,10633216,29917184,
 58785792,100663296,204996608,409993216,652345344,
 1686503424,3376414720,4907335680,14093123584]