A325627 - OEIS

A325627 as a simple table

n	a(n)
1	2
2	5
3	13
4	89
5	233
6	1597
7	113
8	28657
9	514229
10	2417
11	2221
12	59369
13	433494437
14	2971215073
15	55945741
16	2710260697
17	555003497
18	1429913
19	46165371073
20	86020717
21	92180471494753
22	99194853094755497
23	1665088321800481
24	361040209
25	770857978613
26	512119709
27	8242065050061761

[2,5,13,89,233,1597,113,28657,514229,2417,2221, 59369,433494437,2971215073,55945741,2710260697, 555003497,1429913,46165371073,86020717, 92180471494753,99194853094755497,1665088321800481, 361040209,770857978613,512119709,8242065050061761]