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A353734
as a simple table
n
a(n)
1
1
2
2
3
4
4
9
5
19
6
79
7
159
8
319
9
1279
10
10239
11
20479
12
40959
13
163839
14
1310719
15
5242879
16
10485759
[1,2,4,9,19,79,159,319,1279,10239,20479,40959, 163839,1310719,5242879,10485759]