A264747 - OEIS

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A264747 as a simple table

n	a(n)
1	1
2	5
3	7
4	9
5	16
6	17
7	31
8	32
9	127
10	128
11	256
12	257
13	8191
14	8192
15	65536
16	65537
17	131071
18	131072
19	524287
20	524288
21	2147483647
22	2147483648
23	2305843009213693951
24	2305843009213693952
25	618970019642690137449562111

[1,5,7,9,16,17,31,32,127,128,256,257,8191,8192, 65536,65537,131071,131072,524287,524288, 2147483647,2147483648,2305843009213693951, 2305843009213693952,618970019642690137449562111]