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A000225 as a simple table

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

[0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,
 16383,32767,65535,131071,262143,524287,1048575,
 2097151,4194303,8388607,16777215,33554431,
 67108863,134217727,268435455,536870911,1073741823,
 2147483647,4294967295]

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Last modified September 20 21:08 EDT 2017. Contains 292293 sequences.