A081533 - OEIS

A081533 as a simple table

n	a(n)
1	1
2	3
3	7
4	12
5	31
6	28
7	127
8	60
9	91
10	124
11	2047
12	168
13	8191
14	508
15	403
16	360
17	131071
18	546
19	524287
20	744
21	1651
22	8188
23	8388607
24	1170
25	3751
26	32764
27	2821
28	3048
29	536870911
30	2418
31	2147483647
32	2880
33	26611
34	524284
35	15367
36	4368
37	137438953471
38	2097148
39	106483

[1,3,7,12,31,28,127,60,91,124,2047,168,8191,508, 403,360,131071,546,524287,744,1651,8188,8388607, 1170,3751,32764,2821,3048,536870911,2418, 2147483647,2880,26611,524284,15367,4368, 137438953471,2097148,106483]

[1,3,7,12,31,28,127,60,91,124,2047,168,8191,508,
 403,360,131071,546,524287,744,1651,8188,8388607,
 1170,3751,32764,2821,3048,536870911,2418,
 2147483647,2880,26611,524284,15367,4368,
 137438953471,2097148,106483]