A088032 - OEIS

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A088032 as a simple table

n	a(n)
1	3
2	3
3	9
4	3
5	33
6	31
7	129
8	31
9	513
10	511
11	2049
12	1023
13	8193
14	8191
15	32769
16	4095
17	131073
18	131071
19	524289
20	262143
21	2097153
22	2097151
23	8388609
24	2097151

[3,3,9,3,33,31,129,31,513,511,2049,1023,8193,8191, 32769,4095,131073,131071,524289,262143,2097153, 2097151,8388609,2097151]