Fibonacci Numbers

// Problem 10. Fibonacci Numbers

/* Write a program that reads a number n
 * and prints on the console the first n members
 * of the Fibonacci sequence
 * (at a single line, separated by comma and space - ,):
 * 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, ….
Note: You may need to learn how to use loops.
 */

using System;
using System.Collections.Generic;
using System.Linq;

class FibonacciNumbers
{
    static void Main()
    {

        //declarations
        long n;
        string intro = "This program reads a number n and prints on the console the first n members\n" +
        "of the Fibonacci sequence, using the formula: F_n = (phi^n - (1 - phi)^n) / sqrt(5)\n";

        string output = "\nThe first {0} members of the Fibonacci sequence are:\n{1}\n";

        double phi = (1 + Math.Sqrt(5)) / 2; // formula for phi (the golden ratio)

        //user input
        Console.WriteLine(intro);

        do // validates input for n
            Console.Write(@"Please, enter an integer value >= 0 and <= 74
(longer sequences will produce values which cannot be stored into a type long number): ");
        while (!long.TryParse(Console.ReadLine(), out n) || n <= 0);

        double[] nums = new double[n];

        //logic - calculates sequence [0:n], and stores it into the 'nums' array
        for (int i = 0; i < n; i++)
            nums[i] = Math.Round((Math.Pow(phi, i) - Math.Pow((1 - phi), i)) / Math.Sqrt(5));

        // prints sequence
        Console.WriteLine(output, n, string.Join(", ", nums));
    }
}