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A291938 as a simple table

n a(n)
1 0
2 4
3 8
4 32
5 64
6 192
7 384
8 1024
9 2048
10 5120
11 10240
12 24576
13 49152
14 114688
15 229376
16 524288
17 1048576
18 2359296
19 4718592
20 10485760
21 20971520
22 46137344
23 92274688
24 201326592
25 402653184
26 872415232
27 1744830464
28 3758096384
29 7516192768
30 16106127360

[0,4,8,32,64,192,384,1024,2048,5120,10240,24576,
 49152,114688,229376,524288,1048576,2359296,
 4718592,10485760,20971520,46137344,92274688,
 201326592,402653184,872415232,1744830464,
 3758096384,7516192768,16106127360]

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Last modified July 2 16:00 EDT 2020. Contains 335404 sequences. (Running on oeis4.)