c_11_2

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

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

float progression(int n){
    if (n == 0){
        return 1;
    }
    else if (n== 1){
        return 4;
    }
    else
    {
        return 2*progression(n-1) + 0.5*progression(n-2);
    }
}

int main(int argc, char *argv[]) {
    int n;
    printf("Podaj n = ");
    scanf("%d", &n);
    printf("a(%d) = %.2f",n,progression(n));
    return 0;
}