public static int b1(int n)
return b1(n-1)+1/b1(n-1);
public static int b2(int n)
public static int b3(int a,int b)
public static int b4(int k,int n)
return b4(k-1,n)+b4(k-1,n-1);
public static double b5(double a,int n)
return Math.Pow(b5(a,n/2),2);
return a*Math.Pow(b5(a,(n-1)/2),2);
public static void b6(int n,char a,char b, char c)
Console.WriteLine(a+"-->"+c);
public static void Main()