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A180516 as a simple table

n a(n)
1 0
2 1
3 2
4 3
5 7
6 11
7 15
8 31
9 47
10 63
11 127
12 191
13 255
14 511
15 767
16 1023
17 2047
18 3071
19 4095
20 8191
21 12287
22 16383
23 32767
24 49151
25 65535
26 131071
27 196607
28 262143
29 524287
30 786431
31 1048575
32 2097151
33 3145727
34 4194303
35 8388607
36 12582911
37 16777215
38 33554431
39 50331647
40 67108863
41 134217727
42 201326591
43 268435455
44 536870911
45 805306367
46 1073741823
47 2147483647
48 3221225471

[0,1,2,3,7,11,15,31,47,63,127,191,255,511,767,
 1023,2047,3071,4095,8191,12287,16383,32767,49151,
 65535,131071,196607,262143,524287,786431,1048575,
 2097151,3145727,4194303,8388607,12582911,16777215,
 33554431,50331647,67108863,134217727,201326591,
 268435455,536870911,805306367,1073741823,
 2147483647,3221225471]

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Last modified January 20 14:02 EST 2020. Contains 331094 sequences. (Running on oeis4.)