Understanding Fibonacci Sequences in Nature

The Fibonacci sequence starting appears throughout nature, from the arrangement of leaves on a stem to the spiral of galaxies. Today, we'll explore this fascinating mathematical concept and its applications in computer science.

Fibonacci Spiral found in a Nautilus Shell

Mandatory $\LaTeX$ test. The sequence goes like this: $0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ...$.

        def calculate_fibonacci(n):
            if n <= 1:
                return n
            else:
                a, b = 0, 1
                for _ in range(2, n + 1):
                    a, b = b, a + b
                return b

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