Xn sequence

#include <stdio.h>
#include <stdlib.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char *argv[])
{
    int n=2;
    int Xn;
    int i, j;
    int E; //epsilon
    int a[100];
    i = 0;
    printf("Enter the E: ");
    scanf(" %d", &E);
    printf("%d\n", 2);

    do
    {
        a[0]=2;
        a[1]=5;
        Xn=2*a[n-2]+a[n-1];
        a[n]=Xn;
        for(i=0;i<n;i++)
        {
            printf("%d ", a[i]);
        }
        n++;
        printf("\n");

    }
            while(Xn<E);


    return 0;
}