using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace Problem27

{

classProblem27

{

staticvoid Main(string[] args)

{

int num;

int fact1 = 1;

int sum = 0;

int x;

int temp;

Console.WriteLine("Enter Number To Display The Sum Of The Following Series i.e.sum of the factorial of odd series multiply with x \n where power of x is square of corresponding number.\nX1*1! + X9*3! + X25*5! + X49*7! + X81*9! + . . . + Xn2*n!");

num = Convert.ToInt32(Console.ReadLine());

for (int i = 1; i <= num; i++)

{

fact1 = 1;

if (i % 2 != 0)

{

for (int j = 1; j <= i; j++)

{

fact1 = fact1 * j;

}

x =i*i;

temp = x * fact1;

sum = sum + temp;

}

}

Console.WriteLine("\nThe Sum Of The Following Series: " + sum);

Console.ReadKey();

}

}

}

Output: