The Fibonacci numbers

n  F_{n}
1  1
2  1
3  2
4  3
5  5
6  8
7  13
8  21
9  34
10  55
11  89
12  144
13  233
14  377
15  610
16  987
17  1597
18  2584
19  4181
20  6765
21  10946
22  17711
23  28657
24  46368
25  75025