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A135972 as a simple table

n a(n)
1 0
2 1
3 15
4 63
5 255
6 511
7 1023
8 2047
9 4095
10 16383
11 32767
12 65535
13 262143
14 1048575
15 2097151
16 4194303
17 8388607
18 16777215
19 33554431
20 67108863
21 134217727
22 268435455
23 536870911
24 1073741823
25 4294967295
26 8589934591
27 17179869183
28 34359738367

[0,1,15,63,255,511,1023,2047,4095,16383,32767,
 65535,262143,1048575,2097151,4194303,8388607,
 16777215,33554431,67108863,134217727,268435455,
 536870911,1073741823,4294967295,8589934591,
 17179869183,34359738367]

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Last modified April 19 19:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)