A027763 - OEIS

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A027763 as a simple table

n	a(n)
1	2
2	3
3	5
4	11
5	23
6	47
7	283
8	719
9	1439
10	2879
11	34549
12	138197
13	531441
14	1594323
15	4782969
16	14348907
17	43046721
18	86093443
19	344373773
20	688747547
21	3486784401

[2,3,5,11,23,47,283,719,1439,2879,34549,138197, 531441,1594323,4782969,14348907,43046721,86093443, 344373773,688747547,3486784401]