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A289940 as a simple table

n a(n)
0 1
1 1
2 7
3 15
4 7
5 15
6 31
7 63
8 31
9 63
10 127
11 255
12 511
13 1023
14 2047
15 4095
16 511
17 1023
18 2047
19 4095
20 8191
21 16383
22 32767
23 65535
24 131071
25 262143
26 524287
27 1048575
28 2097151
29 4194303
30 8388607
31 16777215
32 131071
33 262143
34 524287
35 1048575
36 52428799
37 104857599
38 3430940671

[1,1,7,15,7,15,31,63,31,63,127,255,511,1023,2047,
 4095,511,1023,2047,4095,8191,16383,32767,65535,
 131071,262143,524287,1048575,2097151,4194303,
 8388607,16777215,131071,262143,524287,1048575,
 52428799,104857599,3430940671]

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Last modified February 28 01:15 EST 2020. Contains 332319 sequences. (Running on oeis4.)