A060152 - OEIS

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A060152 as a simple table

n	a(n)
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	62914
17	65535
18	131071
19	262143
20	524287
21	716479
22	1048575
23	1132639
24	2069471
25	2097151
26	3618111
27	4194303
28	8388607

[1,3,7,15,31,63,127,255,511,1023,2047,4095,8191, 16383,32767,62914,65535,131071,262143,524287, 716479,1048575,1132639,2069471,2097151,3618111, 4194303,8388607]