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A019539
as a simple table
n
a(n)
0
2
1
4
2
7
3
8
4
16
5
15
6
15
7
16
8
63
9
256
10
128
11
511
12
32
13
31
14
31
15
32
16
256
17
4095
18
1023
19
127
20
4095
21
524288
22
131072
23
255
[2,4,7,8,16,15,15,16,63,256,128,511,32,31,31,32, 256,4095,1023,127,4095,524288,131072,255]
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Last modified April 23 23:26 EDT 2024. Contains 371917 sequences. (Running on oeis4.)