PrintSequence

using System;

class Sequence
{
    static void Main()
    {
        Console.Write("Please specify how many members of the sequence 2,-3,4,-5,6,-7 you want to see:");
        int members = int.Parse(Console.ReadLine());
        Console.WriteLine("The first {0} members of the sequence 2,-3,4,-5,6,-7 are:", members);
        Console.WriteLine();
        for (int i = 2; i <=members+1; i++)
        {
            if (i % 2 != 0)
            {
                Console.Write("{0}", -i);
            }
            else
            {
                Console.Write("{0}", i);
            }
            if (i != (members + 1))
            {
                Console.Write(", ");
            }
            else
            {
                Console.Write(".");
            }
        }
        Console.WriteLine();
    }
}