A137574 - OEIS

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A137574 as a simple table

n	a(n)
1	2
2	3
3	5
4	8
5	13
6	21
7	89
8	233
9	1597
10	17711
11	28657
12	46368
13	75025
14	121393
15	514229
16	1346269
17	165580141
18	433494437
19	2971215073
20	53316291173

[2,3,5,8,13,21,89,233,1597,17711,28657,46368, 75025,121393,514229,1346269,165580141,433494437, 2971215073,53316291173]