3    2    1    2.0000000000 
4    3    2    1.5000000000 
5    5    3    1.6666666666 
6    8    5    1.6000000000 
7    13   8    1.6250000000 
8    21   13   1.6153846153 
9    34   21   1.6190476190 
10   55   34   1.6176470588 
11   89   55   1.6181818181 
12   144  89   1.6179775280 
13   233  144  1.6180555555 
14   377  233  1.6180257510 
15   610  377  1.6180371352 
16   987  610  1.6180327868 
17   1597 987  1.6180344478 
18   2584 1597 1.6180338134 
19   4181 2584 1.6180340557