Pascals Triangle two different tries

public class PascalsTriangle
{

    /**
     * @param args
     */
    public static void main( String[] args )
    {

        drawPascalsTriangleFactorial(11);
        //generatePascalsTriangleArrays(100);
    }

    public static long getFactorialOf(int n)
    {
        long startat = 1;
        if(n < 0)
        {
            throw new IllegalArgumentException("N must be a positive number: Your input: " + n);
        }
        for(int num = 2; num <= n; num++)
        {
            startat *= num;
        }
        return startat;
    }

    public static void drawPascalsTriangleFactorial(int maxrows)
    {
        for(int r = 0; r <= maxrows; r++)
        {

            for(int c = 0; c <= (maxrows - r - 1); c++)
            {
                System.out.printf( "%2s"," " );
            }

            for(int c = 0; c <= r; c++)
            {
                System.out.printf( "%4d", ( getFactorialOf(r) / (getFactorialOf(c) * getFactorialOf(r-c) ) ) );

            }
            System.out.println();
        }

    }

    public static void generatePascalsTriangleArrays(int depth)
    {

        long current[] = new long[1];
        current[0] = 1;
        //System.out.println( topnum[0] );
        for(int i = 0; i <= depth; i++)
        {
            //System.out.print( "Row(" + i +") ");
            for(int c = 0; c <= (depth - i - 1); c++)
            {
                System.out.printf( "%2s"," " );
            }
            for(int i2 = 0; i2 < current.length; i2++)
            {
                System.out.printf("%4d ", current[i2]);
            }
            System.out.println();
            current = generateNextRow(current);


        }



    }

    public static long[] generateNextRow(long last[])
    {
        long current[] = new long[(last.length + 1)];
        for(int col = 0; col < current.length; col++)
        {
            current[col] = 1;
        }
        int lColS1 = 0;
        int lColS2 = 0;//lColS1 + 1
        //System.out.println("Last Array Target Cols: " + lColS1 + " " + lColS2 );
        for(int col = 0; col < current.length; col++)
        {


            if(lColS1 < last.length - 1 && col > 0)
            {
                lColS1++;

            }
            if(lColS2 < last.length - 1 && col > 0)
            {
                lColS2 = lColS1 - 1;
            }

            //System.out.println("Last Array Target Cols: " +  lColS1 + " " + lColS2 );
            /*if( (col == 0 && col == current.length - 1) )
            {
                current[col] = 1;
                System.out.println( "Is First Or Last" );
            }*/
            if( col > 0 && col < current.length - 1)
            {
                current[col] = (last[lColS1] + last[lColS2]);
                //System.out.println( "Is Not First Or Last  " + "SlotA " + last[lColS1] + " + " + last[lColS2] + " = " + (last[lColS1] + last[lColS2]) );
            }


        }



        return current;
    }

}