Programa para hallar el N-ésimo término de la serie 0, 14, 40, 78, 124,…

Dado un número N. La tarea es escribir un programa para encontrar el N-ésimo término de la siguiente serie:
 

0, 14, 40, 78, 124…(Términos N)

Ejemplos: 
 

Input: N = 4
Output: 78
For N = 4
Sum(upto 4 terms) = ( 6 * n * n - 4 * n - 2) 
                  = ( 6 * 4 * 4 - 4 * 4 - 2) 
                  =  78
Input: N = 10
Output: 557

Enfoque: El término N generalizado de esta serie:

A continuación se muestra la implementación requerida: 
 

// CPP program to find the N-th term of the series
// 0, 14, 40, 78, 124 ...
#include <iostream>
#include <math.h>
using namespace std;
 
// calculate sum upto Nth term of series
int nthTerm(int n)
{
    return 6 * pow(n, 2) - 4 * n - 2;
}
 
// Driver code
int main()
{
    int N = 4;
 
    cout << nthTerm(N);
 
    return 0;
}

// Java program to find the N-th term of the series
// 0, 14, 40, 78, 124 ...
import java.util.*;
class solution
{
 
// calculate sum up to Nth term of series
static int nthTerm(int n)
{
 
    //return the final sum
    return 6 * (int)Math.pow(n, 2) - 4 * n - 2;
}
 
// Driver code
public static void main(String arr[])
{
    int N = 4;
 
    System.out.println(nthTerm(N));
 
}
}
//This code is contributed by Surendra_Gangwar

# Python3 program to find
# the N-th term of the series
# 0, 14, 40, 78, 124 ...
 
# calculate sum upto Nth
# term of series
def nthTerm(n):
    return int(6 * pow(n, 2) - 4 * n - 2)
 
# Driver code
N = 4
print(nthTerm(N))
 
# This code is contributed
# by Shrikant13

// C# program to find the
// N-th term of the series
// 0, 14, 40, 78, 124 ...
using System;
 
class GFG
{
 
// calculate sum up to Nth
// term of series
static int nthTerm(int n)
{
 
    //return the final sum
    return 6 * (int)Math.Pow(n, 2) -
                        4 * n - 2;
}
 
// Driver code
public static void Main()
{
    int N = 4;
 
    Console.WriteLine(nthTerm(N));
}
}
 
// This code is contributed
// by inder_verma

<?php
// PHP program to find the
// N-th term of the series
// 0, 14, 40, 78, 124 ...
 
// calculate sum upto
// Nth term of series
function nthTerm($n)
{
    return 6 * pow($n, 2) - 4 * $n - 2;
}
 
// Driver code
$N = 4;
 
echo nthTerm($N);
 
// This code is contributed by
// Akanksha Rai(Abby_akku)

<script>
// JavaScript program to find the N-th term of the series
// 0, 14, 40, 78, 124 ...
 
// calculate sum upto Nth term of series
function nthTerm( n)
{
    return 6 * Math.pow(n, 2) - 4 * n - 2;
}
// Driver code
 
    let N = 4;
   document.write( nthTerm(N) );
 
// This code contributed by aashish1995
 
</script>

78

Complejidad de tiempo: O(1)

Complejidad espacial : O (1) ya que usa variables constantes

Nota: La suma de n términos de la serie anterior (Sn) es: