A131056 - OEIS

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A131056 as a simple table

n	a(n)
1	1
2	3
3	7
4	17
5	41
6	97
7	225
8	513
9	1153
10	2561
11	5633
12	12289
13	26625
14	57345
15	122881
16	262145
17	557057
18	1179649
19	2490369
20	5242881
21	11010049
22	23068673
23	48234497
24	100663297
25	209715201
26	436207617
27	905969665

[1,3,7,17,41,97,225,513,1153,2561,5633,12289, 26625,57345,122881,262145,557057,1179649,2490369, 5242881,11010049,23068673,48234497,100663297, 209715201,436207617,905969665]