For a strange reason that I don't know, someone ask to me to implement in a financial application the Fibonacci Sequence.
First of all, I don't know this mathematical role, because I hate this subject!
I seek some information about Fibonacci and this role over Internet and the best information that I found is on wikipedia.
There is a simple way to find and display the number of Fibonacci sequence in C#.

Here, I write the function in C#:

        class Program
        {
            static double FibonacciSequence(double x)
            {
                if (x <= 1) return 1;
                return FibonacciSequence(x - 1) + FibonacciSequence(x - 2);
        }

        static void Main()
        {
                for (int i = 0; i <= 40; i++)
                {
                    Console.WriteLine("Fibonacci number: {0}", FibonacciSequence(i));
                }
                Console.WriteLine("Finished.");
                Console.ReadKey();
            }
        }

and in Vb.net:

    Class Program
        Private Shared Function FibonacciSequence(ByVal x As Double) As Double
            If x <= 1 Then
                Return 1
            End If
            Return FibonacciSequence(x - 1) + FibonacciSequence(x - 2)
        End Function
    
        Private Shared Sub Main()
            For i As Integer = 0 To 40
                Console.WriteLine("Fibonacci number: {0}", FibonacciSequence(i))
            Next
            Console.WriteLine("Finished.")
            Console.ReadKey()
        End Sub
    End Class