LongSequenceFormatted

using System;

class PrintLongSequence
{
    static void Main()
    {
        Console.BufferWidth = 84;
        Console.WindowWidth = Console.BufferWidth;
        for (int i = 2; i <= 1001; i++)
        {
            if (i % 2 == 0)
            {
                Console.Write("{0,4}, ", i);
            }
            else
            {
                if (i == 1001)
                {
                    Console.WriteLine("{0,4} ", -i);
                }
                else
                {
                    Console.Write("{0,4}, ", -i);
                }
            }
        }
    }
}