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A290837 as a simple table

n a(n)
0 1
1 1
2 5
3 15
4 7
5 63
6 127
7 255
8 511
9 1023
10 2047
11 4095
12 8191
13 16383
14 32767
15 65535
16 131071
17 262143
18 524287
19 1048575
20 2097151
21 4194303
22 8388607
23 16777215
24 33554431
25 67108863
26 134217727
27 268435455
28 536870911
29 1073741823
30 2147483647
31 4294967295
32 8589934591

[1,1,5,15,7,63,127,255,511,1023,2047,4095,8191,
 16383,32767,65535,131071,262143,524287,1048575,
 2097151,4194303,8388607,16777215,33554431,
 67108863,134217727,268435455,536870911,1073741823,
 2147483647,4294967295,8589934591]

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Last modified October 19 22:55 EDT 2019. Contains 328244 sequences. (Running on oeis4.)