Write a program to generate the series 18 20 44 138 560 2810 16872 ...

 #include<stdio.h>

 int main()

 {

 // (18*i)+(2*i)

 int a=18,i,n;

 scanf("%d",&n);

  printf("%d ",a);

 for(i=1;i<n;i++)

 {

 a=(a*i)+(2*i);

 printf("%d ",a);

 }

 return(0);

 }

Sample Input :
7

Sample Output :
18 20 44 138 560 2810 16872

Write a program to generate the series 5 9 18 34 59 95 144 ....

 #include<stdio.h>

 #include<math.h>

 int main()

 {

 int n,i,a,d,e=5;

 scanf("%d",&n);

 printf("%d ",e);

 for(i=2;i<=n;i++)

 {

 d=pow(i,2);

 a=e+d;

 printf("%d ",a);

 e=a;

 }

 return(0);

 }

Sample Input :
7

Sample Output :
5 9 18 34 59 95 144

Write a program to generate the series 1 3 4 8 15 27 50 92 169 311 ....

#include<stdio.h>

 int main()

 {

 int a=1,b=3,c=4,d,i,n;

 scanf("%d",&n);

 printf("%d %d %d ",a,b,c);

 for(i=4;i<=n;i++)

 {

 d=a+b+c;

 printf("%d ",d);

 a=b;

  b=c;

 c=d;

 }

 return(0);

 }