I'm using a technic learned in a subject Numerical Methods. You need reproduce step by steep and try to find something familiar between each interaction.
A square have 4 sides, that's why you need multiply the value by four.
But each side merge a point with other in the other side (red circle), you can't count both. That's why yo need subtract 4, one for each corner.
That's how I found this formula: n * 4 - 4
On first and second iteration is difficult to see it... but next iterations can give you an idea about the solution.
Hope it helps.
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I'm using a technic learned in a subject Numerical Methods. You need reproduce step by steep and try to find something familiar between each interaction.
A square have 4 sides, that's why you need multiply the value by four.
But each side merge a point with other in the other side (red circle), you can't count both. That's why yo need subtract 4, one for each corner.
That's how I found this formula:
n * 4 - 4On first and second iteration is difficult to see it... but next iterations can give you an idea about the solution.
Hope it helps.