The **Fibonacci numbers** are numbers generated from the following formula:

*F*_{1}= 1*F*_{2}= 1*F*_{n}=*F*_{n-1}+*F*_{n-2}

As the terms get larger, the ratio between two consecutive terms approaches the golden ratio, about 1.618.

## Examples

The first twenty terms of the sequence are:

1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765

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