A329868 - OEIS

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A329868 as a simple table

n	a(n)
1	0
2	1
3	2
4	7
5	11
6	15
7	18
8	31
9	63
10	75
11	127
12	255
13	511
14	1023
15	1234
16	2047
17	4095
18	8191
19	9638
20	16383
21	32767
22	65535
23	131071
24	262143
25	524287
26	1048575
27	2097151
28	4194303
29	8388607

[0,1,2,7,11,15,18,31,63,75,127,255,511,1023,1234, 2047,4095,8191,9638,16383,32767,65535,131071, 262143,524287,1048575,2097151,4194303,8388607]