### codefight arcade level2 shapeArea

Below we will define an

`n`

-interesting polygon. Your task is to find the area of a polygon for a given `n`

.
A

`1`

-interesting polygon is just a square with a side of length `1`

. An `n`

-interesting polygon is obtained by taking the `n - 1`

-interesting polygon and appending `1`

-interesting polygons to its rim, side by side. You can see the `1`

-, `2`

-, `3`

- and `4`

-interesting polygons in the picture below.
my solution is

F(1) = 1;

F(n) = F(n-1) + 4(n-1)

Easy

link

https://codefights.com/arcade/intro/level-2/yuGuHvcCaFCKk56rJ

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